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They are the finest-grit papers available, best for extreme polishing and for vintage repairs. Beginners Guide To Wet Sanding A Polyurethane Finish. If wet sanded to 1200-1500 grit start, with medium compound. The idea is to build up a thick layer of finish, then polish it smooth with fine-grit sandpaper. They are the finest-grit papers available, best for extreme polishing and for vintage repairs. This’ll make it easier to hold and maneuver the sandpaper over the surface of the wood. The improved version of the classic Fender Strat Bridge, The most consistent, top quality Strat® replacement body on the market today. 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. 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. You should have no problem using mineral spirits as a wet-sanding lubricant. Then sanding polyurethane can be done. As the mineral spirits dries the wet look goes away. 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. There is no substitute for sanding between each coat if you want the best finish. Therefore, wet-sanded surfaces are easier to buff, and the final appearance will not show the super-fine scratches. Yes you do. Then I'll sand with 220 so the finish is an even matte color. Only sand the surface enough to get rid of any unevenness Wrap the sponge in a clean white cotton cloth. Do You Need Special Sandpaper For Wet Sanding? Typically, when you are thinning out oil-based polyurethane or oil-based varnish, you will be working with mineral spirits. Clean the wood very thoroughly to remove sanding dust before each new coat of polyurethane, using a vacuum (if available) and a tack cloth. Everybody does it. Wet sanding can seem a bit complicated at first, but it really isn’t. Wet-sand for a while then dry it all off. 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 check out the latest prices for high grit wet sandpaper over on Amazon. 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. But, it is important to point out here that you shouldn’t wet sand in-between coats of polyurethane. 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. Wet-sanding lubricates the surface, washing out any grit-clogging particles and reduces the heat of sanding. 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. Thoroughly remove san… 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). When wet, exposed endgrain can cause the lacquer to lift around holes. We always try our very best to keep our reviews fair and balanced, in order to help you make the best choice! Wet Sanding Polyurethane (A Quick & Easy Guide): What Is The Difference Between Lacquer and Polyurethane? For Wet-sanding method Use this method for a high-gloss finish. You also have the option to opt-out of these cookies. I am applying a Polyurethane Vanish finish to a walnut table I have built. But curing takes a lot longer. Wet-sand for a while then dry it all off. ), Can I Apply Water Based Polyurethane Over Danish…. 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. Use a piece of paper about two to four inches square. For ease of application, the glue, temperature and materials to be bonded should be above 50°F. For the smoothest finish, start sanding with 100-grit sandpaper, then repeat this with 150-grit, and finish sanding with 220-grit paper. But as long as the polyurethane has cured, then yes, you can wet sand it. If wet sanded to 1200-1500 grit start, with medium compound. Stir the mixture very SLOWLY. Go over the surface again, but this time with 100 grit sand paper. Water is a great choice. (Solved! 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 We also use third-party cookies that help us analyze and understand how you use this website. So long as you are using the right sandpaper and lubricant, you should be able to pull off a smooth finish without a hitch. You can also opt for using mineral spirits too. Huh? Use 1500 and 2000-grits for ultra-delicate sanding. Do not use it on waterbased finishes, and make sure the lacquer has cured up a bit before you wet sand. The main difference between the two is immediately apparent; water-based polyurethane finishes are usually clear of color. Dip the sandpaper in lubricant before you sand. If you dry sand, you ruin your fine finishing paper in 10 seconds. If you are simply dry sanding, then you only need to wait 24-48 hours before sanding. Obviously, do not use electric sanders when wet-sanding.Start the process exactly like above with 400 or 600 grit paper. 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). Lower temperatures will … 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. Ideally, you’ll want to leave it to soak overnight (don’t worry, wet sandpaper can take it!). Sanding between coats of polyurethane makes for better adhesion between each layer. 1. 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). So, How Long Should Polyurethane Dry Before Sanding? Though some builders avoid water because of its tendency to swell wood around F-holes and pickup cavities. 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. Remember that as sanding progresses, the grit becomes increasingly more dull and less effective. The thinner layer of finish hardens faster so it is easier to sand sooner. I only use gloss finishes. 3. Use a very fine-grit abrasive, sanding with the grain of the wood. (In both cases proceed through all buffing stages.). A good formula is three parts polyurethane to one part mineral spirits. 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. Whilst oil-based polyurethane have an amber hue that darkens over time. Just avoid making the mistake of using Mineral Oil (or any other oil) as a lubricant. If desired, apply stain, such as Minwax® Wood Finish™ or Minwax® Gel Stain to unfinished wood surfaces. While soaking the sandpaper is helpful to prepare … Six hundred grit yields a nice satin look. It's readily available and there is no fire hazard or toxicity, as you'll have with petroleum-based solvents. These cookies do not store any personal information. The dream of a glass-smooth tabletop is always spoiled by brush marks and bits of dust and other debris. Every minute or so, remove this with a clean cloth. Many different liquids can be used in Every minute or so, remove this with a clean cloth. Sand with 220 grit after first coat and wipe down with a tack cloth. Stir Minwax® Fast-Drying Polyurethane before and during use to eliminate settling on the bottom of the can. With 2000-grit, you'll be able to do it!) Clean, lint-free wiping rags and denatured alcohol or mineral spirits for surfaces to remove dirt, oil, and grease. Begin as for matte finish. Observe where you need to sand more, then go to it. 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! 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. Sand the dried and cured first coat of polyurethane no sooner than 24 hours after applying it. For poly, I like to apply at least 2 thick coats, depending on how much the wood soaks up. Mineral spirits unlike finish. Sand the Surface. Just be sure you; This site contains affiliate links to products. 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. 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. Stir, don’t shake, the can of polyurethane. Gary386 Member. This website uses cookies to improve your experience. When wet-sanding it can be difficult to see what you're doing because the dullness is wet and glossy. Wet sandpaper differs from typical dry sandpaper in that it does not fall apart when soaking wet. Polyurethane over Mineral Oil. When applying the finish, use long and even brush strokes. Twist the top to form a handle. Wet-sanding scratches may be as deep but they're not as obvious because the edges of the scratch are more rounded. Water, with a small amount of liquid detergent Starting with 250 grit sandpaper, soak the wet sandpaper for 30 minutes in a lubricating solution. Mineral spirits while glue is wet. Wet sandpaper can also be purchased in much higher grit levels too. So there you have it! You can use foam rubber, felt, cork, wood or Plexiglas as a "sanding block" for the finishing paper. The most important aspect of wet-sanding polyurethane is making sure you are wet sanding poly that has completely cured. 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. You can buy wet sandpaper at 200, 500, or even 5,000 grit levels or higher. (Ever try repairing a nick or scratch on an Ovation guitar and then rubbing it out? Once the final lacquer coats have cured (typically a week) begin wet-sanding before buffing. Then I'll apply a wipe on poly mix (1/3 poly, 2/3 mineral spirits). Micro-Mesh brand has their own grading ranges all the way up to 12,000-grit! Removes any lingering dust. We recommend "P-scale" graded papers. Not a kit, this guitar is finished, assembled and wired! 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… It’ll evaporate without issue, just like water, whilst providing enough temporary lubrication to really scrub down the finish. Plain water or dish detergent soapy water will do as a lubricant. This is time consuming, but worth it. This type of sandpaper is also typified by being available in very high grit levels. The thinner layer of finish hardens faster so it is easier to sand sooner. When you wet sand to 800-grit, then you should start buffing with a coarse polishing compound. Even high quality finishing papers will build up quickly when used dry. Well, keep reading to find out more…. wet-sanding, here are some popular examples: Water is a great choice. 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). 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. Can You Wood Burn Over Polyurethane? When you wet sand to 800-grit, then you should start buffing with a coarse polishing compound. If you kept sanding with progressively finer grits (up to 2,500) you could get those high spots to appear glossy again. Fender's most popular pick shape in different materials. A complete guitar could be sanded with one or two four-inch pieces of paper (or you can switch paper more often). 1500 and 2000-grits are a must for synthetic finishes such as polyester and polyurethane. Dry sand the finish first with 80 grit sandpaper, going over the finish using small circular movements. Keep going until you’ve gone over the entire surface. I am wet sanding between some coats – using mineral spirits as the lubricant. However, if you are wet sanding, then you need to make sure you’ve waited long enough for the finish to completely cure. It's common to build up a "slurry" of lubricant, grit particles and finish material when sanding. (No wet sanding). 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. Place a rubber sanding block with 320-grit wet/dry sandpaper on it into the pan. 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. But, this does not impact our reviews and comparisons. 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. Also, make sure that the surface you are sanding is wet too. Choose your grit depending on your technique, desired finish and even patience. Observe where you need to sand more, then go to it. Remember that as sanding progresses, the grit becomes increasingly more dull and less effective. Cured wet-sanded finishes produce a white powder residue and don’t clog up the sandpaper. 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. wet-sanding, here are some popular examples: Though some builders avoid water because of its tendency to swell wood around F-holes and pickup cavities. It is mandatory to procure user consent prior to running these cookies on your website. Reapply the finish per label directions, stirring the product as you work. For most of us, finishing means applying varnish, polyurethane, or paint with a brush. polyurethane finish you’ve used on your project. And playing the waiting game in this instance will pay off later on. 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. We recommend "P-scale" graded papers. Once the final lacquer coats have cured, most finishers begin wet-sanding with fine-grit finishing papers. Follow directions for application and dry times. Once done, run your hand over the surface. 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! Sand until the polyurethane finish is removed. Use 1500 and 2000-grits for ultra-delicate sanding. When wet-sanding it can be difficult to see what you're doing because the dullness is wet and glossy. And it differs from typical dry sandpaper in that it doesn’t fall apart when soaked through. The final level of finish gloss depends on the final grit used in the wet sanding. This website uses cookies to improve your experience while you navigate through the website. Running soaked sandpaper over a bone dry finish will only cause more scuff problems than it fixes. There are two types of polyurethane finish; water-based and oil-based. With 2000-grit, you'll be able to do it!). Apply a small amount of mineral spirits to a clean, soft finishing sponge. Wet-sand cured finishes starting with as fine a grit as possible. Shaking creates air bubbles, which in turn leave bumps … It’ll evaporate without issue, just like water, whilst providing enough temporary lubrication to really scrub down the finish. Even high quality finishing papers will build up quickly when used dry. Note: Paper with a … Pour the polyurethane into a separate container and add some mineral spirits. Thread Modes. Pour the products into a glass jar and gently stir the mixture with a flat stir stick. Polyurethane over Mineral Oil. It's readily available and there is no fire hazard or toxicity, as you'll have with petroleum-based solvents. Yes, you can wet sand polyurethane, but your timing matters a lot here. Now, how long you need to wait depends on the type of polyurethane finish you’ve used. There is a special type of sandpaper specifically made for wet sanding. Therefore, wet-sanded surfaces are easier to buff, and the final appearance will not show the super-fine scratches. This helps make the finish more level and smooth. 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. 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. However, you can go as far as half mineral spirits and half poly. So, How Do You Smooth The Final Coat Of Polyurethane? The ambient humidity each time I applied these coats was around 45-60%. Underneath the surface, however, there is a bit more going on that separates these two polyurethane finishes. You want to remove the "orange peel" texture before buffing (see picture). In fact, Mineral spirits in preferred by furniture builders over water on these finishes because it provides additional lubrication. After the sealer dries, brush on the first coat of oil-based polyurethane. 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. Limitations: Titebond Polyurethane Glue is not for structural applications or for use below the waterline. 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 want to remove the "orange peel" texture before buffing (see picture). Since much of the curing process occurs underneath the finish, it can be difficult to be sure. (Ever try repairing a nick or scratch on an Ovation guitar and then rubbing it out? Soak finishing paper overnight. HOW TO WET-SAND Mix some mineral spirits with a small amount of the polyurethane and then brush it onto the wood 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). Necessary cookies are absolutely essential for the website to function properly. Sand your project with progressively finer grits of sandpaper. Sand the surface to 320-grit. 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. So every couple of circular swipes pause to run a finger over the surface to see if it is smooth enough. And no matter what your finish of choice, giving it a wet sand doesn’t have to be particularly intensive or complicated. If not, go back over it again once more. When wet, exposed endgrain can cause the lacquer to lift around holes. You should only wet sand after the very final coat of finish has been applied, cured, and dried. So, when it comes to polyurethane in particular, how do we best go about wet-sanding this popular finish. (In both cases proceed through all buffing stages.) What Can I Use As A Wet-Sanding Lubricant? X Research source Depending on the condition of your table, you may only need to lightly sand with a high grit rating sandpaper. You can get wet sandpaper from all good hardware stores. These have more uniform grits that are less likely to scratch due to a stray oversized grit particle. 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. Here's how.1. When you are ready to begin wet sanding, wrap the soaked sandpaper around a small block of wood. All grits are not created equal You should have no problem using mineral spirits as a wet-sanding lubricant. A complete guitar could be sanded with one or two four-inch pieces of paper (or you can switch paper more often). Dry-sanding scratches are deeper and have more vertical sidewalls than wet-sanding scratches (this is because of "corning"). Dewaxing solvent for removing wax during cleaning, prior to sanding. 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-sand cured finishes starting with as fine a grit as possible. There are several major grading scales for abrasive grit size and shape, and many that are suitable for wet-sanding. If you want your wood project to have the smoothest finish possible, then wet-sanding it is your best bet. Polyurethanes were invented in the 1930s and have found their way into many home improvement products like foams, glues, finishes, and caulks. Is it as smooth as you’d like it to be? 2. resources Family Handyman: How to Apply Polyurethane Micro-Mesh brand has their own grading ranges all the way up to 12,000-grit! We'll assume you're ok with this, but you can opt-out if you wish. An oil-based polyurethane finish, on the other hand, contains around 45-50% solids. Scrape or sand off dried excess. Make small circular movements over the surface of the wood. These cookies will be stored in your browser only with your consent. As they say, patience is a virtue. Remove all dust with a cloth dampened with mineral spirits. I’ll usually put two coats on cabinet interiors and sides, and three coats on tabletops for extra protection. But opting out of some of these cookies may have an effect on your browsing experience. Click to see full answer Then, can you wet sand water based polyurethane? Leave the first coat to dry properly for 24 hours. Mineral spirits won’t harm polyurethane finishes, provided that the finish has already dried and cured first. Which is very important if you want to get that perfectly smooth finish. 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. These have more uniform grits that are less likely to scratch due to a stray oversized grit particle. 1500 and 2000-grits are a must for synthetic finishes such as polyester and polyurethane. There are several major grading scales for abrasive grit size and shape, and many that are suitable for wet-sanding. Micro-Mesh sanding pads with grits from 1500 to 12,000 will take you to a wet look finish. We may receive a commission for purchases made through these links. Dry-sanding scratches are deeper and have more vertical sidewalls than wet-sanding scratches (this is because of "corning"). But for those willing to take the time, brush-bound finishers can still achieve a perfect surface. Thinning the polyurethane makes it flow on more smoothly and reduces brush marks. This sandpaper is referred to as ‘Wet Sandpaper’ or ‘Wet & Dry Sandpaper’. What we’re getting from mineral spirits is the opportunity to give wood that wet look, temporarily. WHAT TO USE FOR WET-SANDING In a couple of hours, the dried poly just peels right out of the pan. This finish type can take up to 30 days to cure. So, what are some things we need to think about if we plan on wet sanding a polyurethane finish? The usual ratio is about 3 or 4 parts varnish to one part of the mineral spirits. Wet-sanding scratches may be as deep but they're not as obvious because the edges of the scratch are more rounded. I would lightly sand in between each coat with 320 grit sand paper. Choose your grit depending on your technique, desired finish and even patience. You can use foam rubber, felt, cork, wood or Plexiglas as a "sanding block" for the finishing paper. Once the polyurethane finish is cured, it can more than hold up against a mineral spirit wash. Better scratches. Just avoid making the mistake of using Mineral Oil (or any other oil) as a … However, wet sanding does require a certain amount of finesse. Wet-sanding lubricates the surface, washing out any grit-clogging particles and reduces the heat of sanding. And as an Amazon Associate we earn from qualifying purchases. That poly finish may look and feel dry in a matter of days – or even hours. Wet-sanding lubricates the surface, washing out any grit-clogging particles and reduces the heat of sanding. Don't make a new nut just to fix a low slot—fill it! Will Mineral Spirits Harm Polyurethane? Tack cloth – tacky cloth for wiping down the surface before applying coating. What Is The Purpose Of Sanding Between Coats Of Polyurethane? 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. Once the final lacquer coats have cured, most finishers begin wet-sanding with fine-grit finishing papers. But it’ll stick around long enough that you can get a great idea of what the project will look like under finish. Well, then you can call it a job done. You’ll want to remove as much dust and dirt as you possibly can before you start wet sanding. Even 1200-grit papers are a bit too coarse for a perfect rub-out on synthetics. Naphtha This category only includes cookies that ensures basic functionalities and security features of the website. 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. Use a piece of paper about two to four inches square. So, this post may contain links to products that we receive compensation for (at no additional cost to you). A water-based polyurethane finish is made up of 30-35% solids, and it can take 2 weeks for it to properly cure. First of all, you need to think about ratios. Step 4 - Apply the First Coat. 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). Wet Sanding the First Layer. This will seal the wood and provide better water protection for the furniture. 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.

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