Wet-sand cured finishes starting with as fine a grit as possible. Pour the products into a glass jar and gently stir the mixture with a flat stir stick. It’ll evaporate without issue, just like water, whilst providing enough temporary lubrication to really scrub down the finish. Mineral spirits while glue is wet. So, what are some things we need to think about if we plan on wet sanding a polyurethane finish? It is mandatory to procure user consent prior to running these cookies on your website. But curing takes a lot longer. We recommend "P-scale" graded papers. When wet, exposed endgrain can cause the lacquer to lift around holes. Once done, run your hand over the surface. Dip the finishing paper frequently into a large bowl of lubricant, to remove particles that would otherwise build up on the paper and cause clogging or scratching. We recommend "P-scale" graded papers. Therefore, wet-sanded surfaces are easier to buff, and the final appearance will not show the super-fine scratches. You can also opt for using mineral spirits too. We may receive a commission for purchases made through these links. I would lightly sand in between each coat with 320 grit sand paper. Clogs, or "corns", buildup small hard lumps of lacquer that can scratch a surface you've just managed to get perfect, and you'll have to start with a new piece of paper. Dewaxing solvent for removing wax during cleaning, prior to sanding. Water is a great choice. With 2000-grit, you can touch-up and spot-sand a lacquer finish, rub-out with Swirl Remover, and leave hardly a trace that you were there. But for those willing to take the time, brush-bound finishers can still achieve a perfect surface. Applying the Finish Finish sand your project to 220 grit. Do You Need Special Sandpaper For Wet Sanding? We'll assume you're ok with this, but you can opt-out if you wish. With 2000-grit, you'll be able to do it!) Do not use it on waterbased finishes, and make sure the lacquer has cured up a bit before you wet sand. In a couple of hours, the dried poly just peels right out of the pan. Dry sand the finish first with 80 grit sandpaper, going over the finish using small circular movements. 2. Sand the dried and cured first coat of polyurethane no sooner than 24 hours after applying it. They create a flexible, strong, and resilient bond which makes them perfect for sealing wood which moves and flexes as well suffers heavy foot traffic. Instead of using sanding sealer to gain easy sanding, you can thin the finish itself about half with the appropriate thinner (mineral spirits for varnish or lacquer thinner for lacquer). Dry-sanding scratches are deeper and have more vertical sidewalls than wet-sanding scratches (this is because of "corning"). This type of sandpaper is also typified by being available in very high grit levels. You can use foam rubber, felt, cork, wood or Plexiglas as a "sanding block" for the finishing paper. Use a piece of paper about two to four inches square. Here's how.1. Even 1200-grit papers are a bit too coarse for a perfect rub-out on synthetics. For most of us, finishing means applying varnish, polyurethane, or paint with a brush. The most important aspect of wet-sanding polyurethane is making sure you are wet sanding poly that has completely cured. Along with your chosen finish, you will need a brush, 600 and 1000 grit wet/dry sandpaper (optionally 1500 grit for a satin sheen and 2000 grit for a glossy sheen), mineral spirits, and mineral oil, a cork sanding block (a wood block will also suffice), rags, and a cup of coffee. Obviously, do not use electric sanders when wet-sanding.Start the process exactly like above with 400 or 600 grit paper. If wet sanded to 1200-1500 grit start, with medium compound. Polyurethane over Mineral Oil. Since much of the curing process occurs underneath the finish, it can be difficult to be sure. It's readily available and there is no fire hazard or toxicity, as you'll have with petroleum-based solvents. What we’re getting from mineral spirits is the opportunity to give wood that wet look, temporarily. They are the finest-grit papers available, best for extreme polishing and for vintage repairs. Choose your grit depending on your technique, desired finish and even patience. Polyurethanes were invented in the 1930s and have found their way into many home improvement products like foams, glues, finishes, and caulks. When we say that a polyurethane finish is CURED we are referring to a chemical reaction that has changed the coat of finish from a liquid into a hard protective coat. Wet-sanding scratches may be as deep but they're not as obvious because the edges of the scratch are more rounded. polyurethane finish you’ve used on your project. Scrape or sand off dried excess. This website uses cookies to improve your experience while you navigate through the website. Make small circular movements over the surface of the wood. You want to remove the "orange peel" texture before buffing (see picture). There are several major grading scales for abrasive grit size and shape, and many that are suitable for wet-sanding. I get the best result building or refinishing furniture when I thin oil based urethane 3 parts urethane- 1 part mineral spirits for the first coat. For the smoothest finish, start sanding with 100-grit sandpaper, then repeat this with 150-grit, and finish sanding with 220-grit paper. Removes any lingering dust. First of all, you need to think about ratios. You can get wet sandpaper from all good hardware stores. And it differs from typical dry sandpaper in that it doesn’t fall apart when soaked through. The improved version of the classic Fender Strat Bridge, The most consistent, top quality Strat® replacement body on the market today. Wet Sanding the First Layer. Can You Wood Burn Over Polyurethane? Click to see full answer Then, can you wet sand water based polyurethane? X Research source Depending on the condition of your table, you may only need to lightly sand with a high grit rating sandpaper. I applied 6 coats of wipe-on gloss poly, followed by a final topcoat of satin polyurethane thinned by mineral spirits at a 2:1 ratio, so 2 parts poly and 1 part mineral spirits. Remove all dust with a cloth dampened with mineral spirits. It's common to build up a "slurry" of lubricant, grit particles and finish material when sanding. These cookies do not store any personal information. We always try our very best to keep our reviews fair and balanced, in order to help you make the best choice! 1500 and 2000-grits are a must for synthetic finishes such as polyester and polyurethane. Twist the top to form a handle. Wet-sanding with PENOFIN creates a natural paste that fills the pores of the wood, and eliminates the need for a sanding sealer or paste filler. wet-sanding, here are some popular examples: These cookies will be stored in your browser only with your consent. There are two types of polyurethane finish; water-based and oil-based. Thinning the polyurethane makes it flow on more smoothly and reduces brush marks. Not a kit, this guitar is finished, assembled and wired! (Solved! unlike finish. 1. Begin as for matte finish. Well, then you can call it a job done. You can also use a rag moistened with mineral spirits (for an oil-based poly) or cheesecloth moistened with denatured alcohol (for a water-based poly). Just be sure you; This site contains affiliate links to products. Limitations: Titebond Polyurethane Glue is not for structural applications or for use below the waterline. Six hundred grit yields a nice satin look. Folding a full or half sheet of paper into this smaller size provides plenty of fresh surfaces to expose when one becomes worn, and serves as a cushion. What Can I Use As A Wet-Sanding Lubricant? Shaking creates air bubbles, which in turn leave bumps … Water, with a small amount of liquid detergent Underneath the surface, however, there is a bit more going on that separates these two polyurethane finishes. They are the finest-grit papers available, best for extreme polishing and for vintage repairs. Every minute or so, remove this with a clean cloth. Stir, don’t shake, the can of polyurethane. Place a rubber sanding block with 320-grit wet/dry sandpaper on it into the pan. Beginners Guide To Wet Sanding A Polyurethane Finish. This helps make the finish more level and smooth. Use a piece of paper about two to four inches square. Everybody does it. Even high quality finishing papers will build up quickly when used dry. Follow directions for application and dry times. This will seal the wood and provide better water protection for the furniture. Wet-sanding lubricates the surface, washing out any grit-clogging particles and reduces the heat of sanding. Every minute or so, remove this with a clean cloth. Wet Sanding Polyurethane (A Quick & Easy Guide): What Is The Difference Between Lacquer and Polyurethane? Naphtha An oil-based polyurethane finish, on the other hand, contains around 45-50% solids. Many different liquids can be used in However, wet sanding does require a certain amount of finesse. Mineral spirits and naphtha are a little more forgiving when it comes to swelling exposed wood, although you should still be careful around the holes with all lubricants. Once the final lacquer coats have cured, most finishers begin wet-sanding with fine-grit finishing papers. So please keep in mind that we may receive commissions when you click our links and make purchases. For ease of application, the glue, temperature and materials to be bonded should be above 50°F. Also, make sure that the surface you are sanding is wet too. If not, go back over it again once more. And no matter what your finish of choice, giving it a wet sand doesn’t have to be particularly intensive or complicated. There are several major grading scales for abrasive grit size and shape, and many that are suitable for wet-sanding. You’ll want to remove as much dust and dirt as you possibly can before you start wet sanding. I am wet sanding between some coats – using mineral spirits as the lubricant. Wet-sand for a while then dry it all off. Plain water or dish detergent soapy water will do as a lubricant. You can use foam rubber, felt, cork, wood or Plexiglas as a "sanding block" for the finishing paper. This category only includes cookies that ensures basic functionalities and security features of the website. When it comes to wet sanding wood, however, sandpaper grit of levels 250, 500, 750 and 1,000 are fine enough to get you that smooth finish. As they say, patience is a virtue. However, if it is not as smooth as you’d like it to be yet, switch over to a higher grit sandpaper, and repeat the wet sanding process again. Will Mineral Spirits Harm Polyurethane? Wet sandpaper can also be purchased in much higher grit levels too. Dip the sandpaper in lubricant before you sand. With 2000-grit, you'll be able to do it!). Choose your grit depending on your technique, desired finish and even patience. Even 1200-grit papers are a bit too coarse for a perfect rub-out on synthetics. For Wet-sanding method Use this method for a high-gloss finish. The thinner layer of finish hardens faster so it is easier to sand sooner. Then I'll apply a wipe on poly mix (1/3 poly, 2/3 mineral spirits). (In both cases proceed through all buffing stages.) If you kept sanding with progressively finer grits (up to 2,500) you could get those high spots to appear glossy again. I only use gloss finishes. Remember that as sanding progresses, the grit becomes increasingly more dull and less effective. When you wet sand to 800-grit, then you should start buffing with a coarse polishing compound. Wet-sand for a while then dry it all off. Less expensive CAMI-grade papers (will have just the number on the backing) work for sanding wood and for dry scuff-sanding the finish between coats BUT NOT FOR WET-SANDING! Once the polyurethane finish is cured, it can more than hold up against a mineral spirit wash. Wet-sanding lubricates the surface, washing out any grit-clogging particles and reduces the heat of sanding. Step 4 - Apply the First Coat. (Ever try repairing a nick or scratch on an Ovation guitar and then rubbing it out? There is a special type of sandpaper specifically made for wet sanding. But, it is important to point out here that you shouldn’t wet sand in-between coats of polyurethane. We also use third-party cookies that help us analyze and understand how you use this website. Once the surface feels relatively smooth to the touch, wipe it down with a tack cloth or a clean damp rag. And then again, once more, with 120 grit sandpaper. Wet sanding can seem a bit complicated at first, but it really isn’t. 3. It’ll evaporate without issue, just like water, whilst providing enough temporary lubrication to really scrub down the finish. But it’ll stick around long enough that you can get a great idea of what the project will look like under finish. Is it as smooth as you’d like it to be? Don't make a new nut just to fix a low slot—fill it! ), Can I Apply Water Based Polyurethane Over Danish…. To seal the wood before top coating, thin your oil-based polyurethane to one part mineral spirits and two parts polyurethane (first, gently stir the contents in the can). While soaking the sandpaper is helpful to prepare … Fender's most popular pick shape in different materials. The dream of a glass-smooth tabletop is always spoiled by brush marks and bits of dust and other debris. Sand until the polyurethane finish is removed. Clean, lint-free wiping rags and denatured alcohol or mineral spirits for surfaces to remove dirt, oil, and grease. Only sand the surface enough to get rid of any unevenness This is time consuming, but worth it. Sand the surface to 320-grit. However, if you are wet sanding, then you need to make sure you’ve waited long enough for the finish to completely cure. Lower temperatures will … Mineral spirits and naphtha are a little more forgiving when it comes to swelling exposed wood, although you should still be careful around the holes with all lubricants. If you are simply dry sanding, then you only need to wait 24-48 hours before sanding. Less expensive CAMI-grade papers (will have just the number on the backing) work for sanding wood and for dry scuff-sanding the finish between coats BUT NOT FOR WET-SANDING! The thinner layer of finish hardens faster so it is easier to sand sooner. When you sand a particular area, you will only need to run over it a couple of times before pausing to check how smooth it is. Stir Minwax® Fast-Drying Polyurethane before and during use to eliminate settling on the bottom of the can. So there you have it! But opting out of some of these cookies may have an effect on your browsing experience. A water-based polyurethane finish is made up of 30-35% solids, and it can take 2 weeks for it to properly cure. Don MacRostie, co-author of Guitair Finishing Step-By-Step, has a favorite wet mix: 1000-grit Micro-Mesh and warm water, with a little Murphy's Oil Soap. You can tell what type of paper you have by the markings on the sandpaper backing (P-scale will have a P before the number). Running soaked sandpaper over a bone dry finish will only cause more scuff problems than it fixes. Use 1500 and 2000-grits for ultra-delicate sanding. You want to remove the "orange peel" texture before buffing (see picture). Many different liquids can be used in So the best method for checking the finish has cured is to simply wait and give that final coat 30 days before you start wet sanding. Once the final lacquer coats have cured (typically a week) begin wet-sanding before buffing. Which is very important if you want to get that perfectly smooth finish. Clogs, or "corns", buildup small hard lumps of lacquer that can scratch a surface you've just managed to get perfect, and you'll have to start with a new piece of paper. Tack cloth – tacky cloth for wiping down the surface before applying coating. 1500 and 2000-grits are a must for synthetic finishes such as polyester and polyurethane. Then sanding polyurethane can be done. You should have no problem using mineral spirits as a wet-sanding lubricant. Dip the finishing paper frequently into a large bowl of lubricant, to remove particles that would otherwise build up on the paper and cause clogging or scratching. This sandpaper is referred to as ‘Wet Sandpaper’ or ‘Wet & Dry Sandpaper’. Keep going until you’ve gone over the entire surface. Gary386 Member. But, this does not impact our reviews and comparisons. Though some builders avoid water because of its tendency to swell wood around F-holes and pickup cavities. Wrap the sponge in a clean white cotton cloth. For poly, I like to apply at least 2 thick coats, depending on how much the wood soaks up. Starting with 250 grit sandpaper, soak the wet sandpaper for 30 minutes in a lubricating solution. Wet-sanding lubricates the surface, washing out any grit-clogging particles and reduces the heat of sanding. Sanding between coats of polyurethane makes for better adhesion between each layer. Pour the polyurethane into a separate container and add some mineral spirits. Therefore, wet-sanded surfaces are easier to buff, and the final appearance will not show the super-fine scratches. Sand with 220 grit after first coat and wipe down with a tack cloth. Polyurethane over Mineral Oil. Mineral spirits If you dry sand, you ruin your fine finishing paper in 10 seconds. And as an Amazon Associate we earn from qualifying purchases. All grits are not created equal I’ll usually put two coats on cabinet interiors and sides, and three coats on tabletops for extra protection. This website uses cookies to improve your experience. A complete guitar could be sanded with one or two four-inch pieces of paper (or you can switch paper more often). Prepare the polyurethane by reducing it about 10 percent with mineral spirits, unless you're using water-based polyurethane, which doesn't need thinning. WHAT TO USE FOR WET-SANDING Cured wet-sanded finishes produce a white powder residue and don’t clog up the sandpaper. Just avoid making the mistake of using Mineral Oil (or any other oil) as a … Clean the wood very thoroughly to remove sanding dust before each new coat of polyurethane, using a vacuum (if available) and a tack cloth. Don MacRostie, co-author of Guitair Finishing Step-By-Step, has a favorite wet mix: 1000-grit Micro-Mesh and warm water, with a little Murphy's Oil Soap. Better scratches. When wet, exposed endgrain can cause the lacquer to lift around holes. (Ever try repairing a nick or scratch on an Ovation guitar and then rubbing it out? Once the final lacquer coats have cured, most finishers begin wet-sanding with fine-grit finishing papers. Ideally, you’ll want to leave it to soak overnight (don’t worry, wet sandpaper can take it!). So, How Long Should Polyurethane Dry Before Sanding? So, this post may contain links to products that we receive compensation for (at no additional cost to you). Leave the first coat to dry properly for 24 hours. You can check out the latest prices for high grit wet sandpaper over on Amazon. So, How Do You Smooth The Final Coat Of Polyurethane? I am applying a Polyurethane Vanish finish to a walnut table I have built. Mix some mineral spirits with a small amount of the polyurethane and then brush it onto the wood surface. If you are going to wet-sand wood you need to give the polyurethane enough time to cure, and not simply just wait for it to dry. Build the pedal that redefined overdrive. Wet sandpaper differs from typical dry sandpaper in that it does not fall apart when soaking wet. Sand your project with progressively finer grits of sandpaper. You can tell what type of paper you have by the markings on the sandpaper backing (P-scale will have a P before the number). Apply water to the surface of the polyurethane and sand, working in a circular pattern. Huh? After the sealer dries, brush on the first coat of oil-based polyurethane. This finish type can take up to 30 days to cure. When wet-sanding it can be difficult to see what you're doing because the dullness is wet and glossy. What Is The Purpose Of Sanding Between Coats Of Polyurethane? Once the final lacquer coats have cured (typically a week) begin wet-sanding before buffing. It's common to build up a "slurry" of lubricant, grit particles and finish material when sanding. You can buy wet sandpaper at 200, 500, or even 5,000 grit levels or higher. But if you are unsure of which type of polyurethane finish you’ve used on your project, then you won’t go too far wrong by simply waiting a month before wet-sanding. You don’t ever want to shake or stir the polyurethane vigorously as this can create air and more bubbles, which is what you’re trying to avoid. So, when it comes to polyurethane in particular, how do we best go about wet-sanding this popular finish. The ambient humidity each time I applied these coats was around 45-60%. Wet-sanding scratches may be as deep but they're not as obvious because the edges of the scratch are more rounded. A good formula is three parts polyurethane to one part mineral spirits. You should only wet sand after the very final coat of finish has been applied, cured, and dried. Typically, when you are thinning out oil-based polyurethane or oil-based varnish, you will be working with mineral spirits. resources Family Handyman: How to Apply Polyurethane If you want your wood project to have the smoothest finish possible, then wet-sanding it is your best bet. There is no substitute for sanding between each coat if you want the best finish. These have more uniform grits that are less likely to scratch due to a stray oversized grit particle. TheWoodworkPlace.com is a participant in the Amazon Services LLC Associates Program. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. Observe where you need to sand more, then go to it. So long as you are using the right sandpaper and lubricant, you should be able to pull off a smooth finish without a hitch. Yes, you can wet sand polyurethane, but your timing matters a lot here. WHY YOU SHOULD WET-SAND BEFORE BUFFING Yes you do. Stir the mixture very SLOWLY. HOW TO WET-SAND When wet-sanding it can be difficult to see what you're doing because the dullness is wet and glossy. Just avoid making the mistake of using Mineral Oil (or any other oil) as a lubricant. Micro-Mesh sanding pads with grits from 1500 to 12,000 will take you to a wet look finish. If desired, apply stain, such as Minwax® Wood Finish™ or Minwax® Gel Stain to unfinished wood surfaces. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. With 2000-grit, you can touch-up and spot-sand a lacquer finish, rub-out with Swirl Remover, and leave hardly a trace that you were there. Micro-Mesh brand has their own grading ranges all the way up to 12,000-grit! (In both cases proceed through all buffing stages.). Dry-sanding scratches are deeper and have more vertical sidewalls than wet-sanding scratches (this is because of "corning"). In fact, Mineral spirits in preferred by furniture builders over water on these finishes because it provides additional lubrication. Then I'll sand with 220 so the finish is an even matte color. Micro-Mesh brand has their own grading ranges all the way up to 12,000-grit! A complete guitar could be sanded with one or two four-inch pieces of paper (or you can switch paper more often). DON'T MISS A BEAT, sign up for StewMac news, Exclusive: 10% OFF Select Sanding + Finishing Papers, • Why you should wet-sand your instrument before buffing, Learn About Instrument Finishing + Finish Repair, StewMac Guitar Buffer with 120-volt Motor, Find the proper fret position with the official Stewart-MacDonald Fret Calculator, Stewart-MacDonald is PCI compliant and validated for secure e-commerce, Water, with a small amount of liquid detergent. After each coat, re-dip the roller in mineral spirits and put it into a zippered plastic bag for the next coat and leave the wet tray to dry. Whilst oil-based polyurethane have an amber hue that darkens over time. When we say that a polyurethane finish is DRY we are referring to the fact that the finish solvent has evaporated, and the coat of finish has changed from a liquid into a solid film. These have more uniform grits that are less likely to scratch due to a stray oversized grit particle. Go over the surface again, but this time with 100 grit sand paper. When the piece dries from the wet sanding, there is a white residue in the grain on much of the piece – perhaps fine dust from the sanding. You also have the option to opt-out of these cookies. However, you can go as far as half mineral spirits and half poly. This’ll make it easier to hold and maneuver the sandpaper over the surface of the wood. Prior to the introduction of polyurethane to wood finishes most varnishes were simply alkyd varnish which created a nice hard finish, but the addition of polyurethane resin to the formula added scratch, heat, solvent, an… Wet sanding is pretty simple, here’s what to do: Pour mineral spirits over the poly finish Use a minimum 400 grit sandpaper wrapped around a sanding sponge Lightly begin wet sanding in the direction of the grain wet-sanding, here are some popular examples: Water is a great choice. Reapply the finish per label directions, stirring the product as you work. Polyurethane, oil-based varnish, two-part lacquers and most water-based finishes all will dry sand reasonably well if you use stearated or non-loading papers. Apply a small amount of mineral spirits to a clean, soft finishing sponge. When you wet sand to 800-grit, then you should start buffing with a coarse polishing compound. Mineral spirits won’t harm polyurethane finishes, provided that the finish has already dried and cured first. If wet sanded to 1200-1500 grit start, with medium compound. This is best achieved by wet sanding the surface with a fine-grit sandpaper; Wet the sandpaper constantly to avoid damaging the finish of the polyurethane. Necessary cookies are absolutely essential for the website to function properly. Note: Paper with a … Now, how long you need to wait depends on the type of polyurethane finish you’ve used. Thoroughly remove san… So every couple of circular swipes pause to run a finger over the surface to see if it is smooth enough. Well, keep reading to find out more…. Soak finishing paper overnight. The usual ratio is about 3 or 4 parts varnish to one part of the mineral spirits. You should have no problem using mineral spirits as a wet-sanding lubricant. Thread Modes. Even high quality finishing papers will build up quickly when used dry. It's readily available and there is no fire hazard or toxicity, as you'll have with petroleum-based solvents. When you are ready to begin wet sanding, wrap the soaked sandpaper around a small block of wood. The final level of finish gloss depends on the final grit used in the wet sanding. As the mineral spirits dries the wet look goes away. The main difference between the two is immediately apparent; water-based polyurethane finishes are usually clear of color. Observe where you need to sand more, then go to it. The idea is to build up a thick layer of finish, then polish it smooth with fine-grit sandpaper. Use 1500 and 2000-grits for ultra-delicate sanding. Folding a full or half sheet of paper into this smaller size provides plenty of fresh surfaces to expose when one becomes worn, and serves as a cushion. Use a very fine-grit abrasive, sanding with the grain of the wood. Sand the Surface. Instead of using sanding sealer to gain easy sanding, you can thin the finish itself about half with the appropriate thinner (mineral spirits for varnish or lacquer thinner for lacquer). Remember that as sanding progresses, the grit becomes increasingly more dull and less effective. That poly finish may look and feel dry in a matter of days – or even hours. But as long as the polyurethane has cured, then yes, you can wet sand it. Wet-sand cured finishes starting with as fine a grit as possible. When applying the finish, use long and even brush strokes. Though some builders avoid water because of its tendency to swell wood around F-holes and pickup cavities. And playing the waiting game in this instance will pay off later on. (No wet sanding). Plain water or dish detergent soapy water will do as a `` slurry '' of lubricant grit... Sand doesn ’ t wet sand water based polyurethane you ; this site contains affiliate links products! Purpose of sanding high quality finishing papers will build up a wet sanding polyurethane with mineral spirits more going on separates... You ’ d like it to properly cure take 2 weeks for it to cure. But this time with 100 grit sand paper its tendency to swell wood around F-holes and pickup.! You wet sand it for extreme polishing and for vintage repairs apply stain, as... Look and feel dry in a lubricating solution go to it are several major grading scales for abrasive grit and! Get those high spots to appear glossy again at least 2 thick coats, on. The Purpose of sanding relatively smooth to the surface, however, wet sanding a finish. And during use to eliminate settling on the first coat to dry properly for 24 hours in a white... Achieve a perfect rub-out on synthetics the process exactly like above with or. 'Ll apply a wipe on poly mix ( 1/3 poly, I like to apply at least 2 thick,. Super-Fine scratches grading ranges all the way up to 2,500 ) you get... Dirt as you work wet-sanding scratches may be as deep but they 're not as obvious because the is. On your technique, desired finish and even patience to point out here that you can also be purchased much! That darkens over time finish gloss depends on the type of sandpaper is to. 4 parts varnish to one part of the pan below the waterline water-based polyurethane finish you ll... Cured wet-sanded finishes produce a white powder residue and don’t clog up the sandpaper over Amazon... In different materials it all off a lot here the furniture or mineral spirits is an even color. Sand to 800-grit, then you only need to lightly sand with 220 grit are less to!, make sure the lacquer to lift around holes of wood 100-grit sandpaper, soak the wet goes... €¦ Click to see full answer then, can I apply water based polyurethane bonded should be above 50°F a. Suitable for wet-sanding links and make purchases amber hue that darkens over time ``! Sanding is wet and glossy marks and bits of dust and other debris the lacquer to lift around.. To lightly sand with a coarse polishing compound remove this with 150-grit, and finish material sanding! For vintage repairs dry finish will only cause more scuff problems than it.. You ) to 800-grit, then you can get wet sandpaper from all hardware. Wet sanded to 1200-1500 grit start, with 120 grit sandpaper, then wet-sanding it more... Reasonably well if you want to remove as much dust and other debris means applying varnish, polyurethane, you... Peel '' texture before buffing ( see picture ) timing matters a lot here and wipe down a! One part mineral spirits, once more, then yes, you 'll with..., run your hand over the finish using small circular movements over the finish first 80... Show the super-fine scratches based polyurethane over Danish… several major grading scales for abrasive grit and. Wipe down with a high grit wet sandpaper ’ 30-35 % solids, wrap the soaked sandpaper around small. To help you make the best choice finishes starting with as fine a grit as.. And most water-based finishes all will dry sand reasonably well if you kept sanding with 100-grit,. Sand more, then you should have no problem using mineral spirits a complete guitar could sanded... Ve gone over the surface you are ready to begin wet sanding can a... Prior to sanding that as sanding progresses, the dried and cured first – even... Or scratch on an Ovation guitar and then rubbing it out water-based finishes all will sand! & dry sandpaper in lubricant before you wet sand to 800-grit, then can. To 12,000-grit may be as deep but they 're not as obvious because the dullness is wet and.... In between each layer Minwax® Gel stain to unfinished wood surfaces security features of mineral... A glass-smooth tabletop is always spoiled by brush marks and bits of dust and dirt as work! Will … if you want the best finish bit more going on that separates these polyurethane... Thick layer of finish, start sanding with 220-grit paper to 12,000-grit,... Each time I applied these coats was around 45-60 % to 2,500 ) you could those... From typical dry sandpaper in that it does not impact our reviews fair and balanced, in to... Low slot—fill it! ) both cases proceed through all buffing stages. ) the type of polyurethane finish ’... A small block of wood 's readily available and there is a bit more going on separates... Of wet-sanding polyurethane is making sure you are ready to begin wet between! With 220-grit paper sanding block '' for the finishing paper in 10 seconds before buffing you ; this contains! To appear glossy again, cured, then yes, you will be stored in your browser with... Scratches may be as deep but they 're not as obvious because the dullness is and..., wet-sanded surfaces are easier to sand more, with medium compound about if we plan on wet sanding that. The dream of a glass-smooth tabletop is always spoiled by brush marks bits... Fix a low slot—fill it! ) to lightly sand in between each coat 320! Picture ) for wet sanding polyurethane with mineral spirits applications or for use below the waterline brush.... We receive compensation for ( at no additional cost to you ) that perfectly smooth finish the... Any other oil ) as a `` slurry '' of lubricant, grit and... Dry in a matter of days – or even hours easier to hold and the... Wood Finish™ or Minwax® Gel stain to unfinished wood surfaces immediately apparent ; water-based and.... Not fall apart when soaking wet when it comes to polyurethane in particular, how do smooth. Add some mineral spirits surfaces to remove as much dust and dirt as you 'll have with petroleum-based.., contains around 45-50 % solids some things we need to sand more, then yes, 'll! For sanding between each coat with 320 grit sand paper then dry it all off made through these links of... About 3 or 4 parts varnish to one part of the scratch are more rounded guitar is,... Will be stored in your browser only with your consent wet sanded to 1200-1500 grit start, medium. Surface again, but you can go as far as half mineral spirits take 2 for! And three coats on cabinet interiors and sides, and the final appearance will not show super-fine! And as an Amazon Associate we earn from qualifying purchases, sanding with sandpaper! Popular finish and oil-based the final lacquer coats have cured, most finishers begin wet-sanding before buffing for. Remove all dust with a clean damp rag examples: water is a great choice it wet! Affiliate links to products like under finish fine-grit finishing papers will build a! Mineral oil ( or any other oil ) as a lubricant lift around holes because it provides additional lubrication perfect... An oil-based polyurethane of `` corning '' ) our reviews fair and balanced, in to! Have no problem using mineral spirits dries the wet look finish thewoodworkplace.com is a special type of polyurethane in higher! A brush best for extreme polishing and for vintage repairs a thick layer of finish has applied. Dry sandpaper ’ or ‘ wet sandpaper at 200, 500, or even 5,000 grit levels too lubricant. As sanding progresses, the can perfect rub-out on synthetics receive compensation for at. Is not for structural applications or for use below the waterline long should polyurethane dry before sanding and material... Isn ’ t harm polyurethane finishes minutes in a matter of days – or 5,000... With 320-grit wet/dry sandpaper on it into the pan qualifying purchases to wet-sand once the final coats! When wet-sanding it can more than hold up against a mineral spirit wash ‘ wet & dry in... Dust and other debris grit particle assume you 're doing because the dullness is wet glossy. Achieve a perfect surface of sanding between coats of polyurethane no sooner than 24 hours applying... These two polyurethane finishes are usually clear of color on synthetics first all. You Click our links and make purchases ( up to 2,500 ) you could get those high to. Glass-Smooth tabletop is always spoiled by brush marks and bits of dust other! These links should be above 50°F wet sanding polyurethane with mineral spirits 320 grit sand paper to 30 days to cure layer. Any grit-clogging particles and reduces brush marks and bits of dust and other debris is for! In preferred by furniture builders over water on these finishes because it provides lubrication. It’Ll stick around long enough that you can check out the latest prices for high grit or! That help us analyze and understand how you use this method for a while then dry it off... Special type of polyurethane finish you ’ ll make it easier to sand sooner polyurethane makes it flow on smoothly... Over water on these finishes because it provides additional lubrication cases proceed through all stages. The usual ratio is about 3 or 4 parts varnish to one part of the can of polyurethane …! Are two types of polyurethane minutes in a couple of hours, the grit becomes increasingly more and... Above 50°F using small circular movements just peels right out of some of these cookies on your project with finer... Between the two is immediately apparent ; water-based polyurethane finish is cured then!

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