Intense water pressure may strip the paint. The poly won’t really make a latex paint (sounds like you used latex) appear darker like it does with chalk-style paint, however. Dispose of your materials properly. This myth is somewhat complicated. Show more unanswered questions. It’s not your “repetition” of the myths that perpetuates them. Do not apply water-based polyurethane over the top of gloss latex and acrylic enamel. You won’t damage the coat underneath, and you don’t have to get all the polyurethane removed. Both oil- and water-based polyurethane can be applied to latex/acrylic paint; however, oil-based polyurethane will create a yellow or amber hue, especially to light colors. That’s what I get. The two-component polyurethanes are becoming more common in the furniture industry because they perform well and have a very high solids content, meaning less solvent to escape into the atmosphere. Furthermore, polyurethane sands easily, so there isn’t any need for a sanding sealer. Minwax ® Polycrylic ® Protective Finish is a crystal clear, fast-drying protective topcoat for use over bare wood, oil- and water-based stains, paint and wallpaper. ", https://www.popularwoodworking.com/wp-content/uploads/popwood_logos-01.png, https://www.popularwoodworking.com/wp-content/uploads/2008/06/7_myths_of_polyurthane.jpg, Shaker Storage & Shelving Shop Resources Collection, © 2020 Cruz Bay Publishing, Inc. All rights reserved, Six Awesome Projects to Jumpstart Your Year, Free Woodworking Downloads From Lee Valley, I Can Do That! Second, finishes don’t “wet” and bond as well to gloss surfaces as they do to dull surfaces. A polyurethane finish prevents other materials from adhering to its surface. Polyurethane Over Paint In terms of how hard Polyurethane is, it falls somewhere between rubber and plastic. There are almost always gaps in your sanding – for example, in the pores, in recesses and often just because you aren’t being thorough enough. Water-based polyurethane is well-suited for low-sheen flat, eggshell or satin latex paint. Can I apply poly over poly that was coated 5 years ago? Always read the labels, as many oil paints, stains, lacquers and varnishes are extremely toxic. It was stained with a stain containing polyurethane. MYTH #5: Thinning with Penetrol reduces brush marks. 1 teaspoon - To keep a partially filled can of oil-based poly from skinning over, cover the finish with this amount of mineral spirits. Go ahead and shake a can of poly and try to finish with it. So adding mineral spirits is not thinning, Or open does not mean drying slower. The finish “keys” or “locks” into the sanding scratches. A polyurethane finish or varnish is a durable coating that protects a wooden surface, which means you can’t paint directly over it or your paint won’t adhere to it. Do not apply water-based polyurethane over the top of gloss latex and acrylic enamel. Google Adsense Advertisement. Not only is this a tricky procedure that will lead to sagging if you aren’t careful to keep the finish thin on the surface (similar to the difficulty brushing vertical surfaces), but the procedure doesn’t make any sense. Can I apply high gloss over a base coat of satin finish? Answer. A damp environment can affect the curing process of your paint. Answer. Coats and Dry Times To get a solid finish, apply three coats of paint over the oil-based primer. There are two ways to deal with bubbles that won’t pop out. You can also abrade with steel wool or a synthetic abrasive pad, but neither cuts and levels as well as sandpaper. Applying one or two coats of polyurethane to a painted surface is a good way to protect the paint. This isn’t to say you shouldn’t use water-based polyurethane. MYTH #7: Scuff sand between coats to get a good bond. Pure polyurethanes (with no alkyd resin) are always two-part products. 20th Mar 2015 05:00 PM # ADS. The downside is that oil-based products dry to a slightly harder finish than water-based ones, so if the hardness of the finish is more important for your project than the color, select an oil-based polyurethane. How to Prevent Bubbles in Furniture Refinishing. Cheers. Or I misunderstood, thats not what he meant? Polyurethane paint’s abrasion and weathering resistance is used for the protective undercoating on a car, and for a vehicle’s clear top coat which seals and protects the colour. Polyurethane dries slowly, so there are always dust nibs that should be sanded out before the next coat is applied. All levels of finishing are burdened with myths, but the types of finishes used by amateurs and sold in home centers and woodworking stores suffer the most. But they appear in the brushed finish even if you don’t shake the can. Some of the myths make no sense but do no harm. Can you put polyurethane over chalk paint though the paint is a bit thicker than latex then it does not necessarily cover 1 jacket. Can you paint over oil based stain and varnish with polyurethane? The first is to wipe off the bubbled coat of finish using a rag dampened with mineral spirits, naphtha or turpentine. I needed to just put a clear water-based polyurethane over the paint. Spray poly goes on just like spray paint. In contrast, woodworking is physics. If you painted your cabinets with any of these paints, apply a water-based poly over the top to prolong the life of the finish. If the tipping-off doesn’t work well enough, add 5 or 10 percent mineral spirits to keep the finish “open” longer and give the bubbles more time to pop out. He didn’t necessarily recommend shaking the can. Use a water-based product if you're concerned about color because it won't yellow as much as an oil-based one. Yes, you can put polyurethane over chalk paint. (about 30-35 seconds for the viscosity cup). Oil-based polyurethane levels out to a smoother finish, although it takes several hours longer to dry. Applying one or two coats of polyurethane to a painted surface is a recommended way to protect the paint. Use it over chalk paint for a robust finish that will withstand general wear and tear perfect for dining room tables outdoor furniture floors and skirting boards. 2. It’s almost impossible to brush this slowly. Always sand the polyurethane before painting. The soft touch coatings that make a dashboard, armrest, or steering wheel feel soft and luxurious are … Ask a Question. You can apply polyurethane over any type of paint, as long as it's clean and has been properly prepared. The polyurethane resin adds scratch, heat, solvent and water resistance to the alkyd varnish. This is a very old myth that is more “misleading” than “myth” because it’s true but it doesn’t matter. To keep the polyurethane free of bubbles, stir it with a paint stick rather than shaking it, and use a natural-bristle brush rather than a foam brush. Brush lightly back over the finish right after application. It was fine, but I wasn’t impressed enough with it to use it again. Application Process. The biggest problem using a flat block is that you are more likely to clog the sandpaper and the clogs, or “corns,” will put deeper scratches into the finish that might telegraph through the next coat. These finishes are sometimes labeled “polyurethane,” with no obvious reference to their being an entirely different class of finish, one that performs less well than oil-based polyurethane and has very different application characteristics. I use two part polyurethanes a good bit and like them a lot more than the one part types. But until recently I had never seen Penetrol recommended for use in polyurethane, which is usually applied indoors in more ambient working conditions and brushes easily without drag. Varathane Poly Over Chalk Paint This Comes In Satin Or A Soft . Painting over polyurethane woodwork can be time consuming, and maddening. More important, the longer polyurethane is brushed the more thinner evaporates, and this causes the finish to thicken and brush marks to be more pronounced. However, for the best results, ensure that you use a water based formula such as Minwax; otherwise, you will have your surface starting to yellow a little sooner. Polyurethane can be oil- or water-based, and you can use either kind over latex paint; however, oil-based polyurethane tends to yellow as it ages, whereas water-based varieties stay … Painting over polyurethane requires patience, time, and effort. Others purport to solve a problem, and when following them doesn’t help, frustration sets in. The only limitations I’ve found with that system are that the system is a bit expensive unless you’re working with these coatings a lot and keep ’em on hand and that you’ve got to be really careful about the stains you try to use under epoxy resins. As some of the responses would seem to indicate, one would do well to actually read it before responding. Save up to 68% on 7 issues of woodworking projects and tricks. A polyurethane finish or varnish is a durable coating that protects a wooden surface, which means you can’t paint directly over it or your paint won’t adhere to it. How to apply wipe on poly over paint: To begin I started by simply stirring my wipe on poly tough coat with a paint stick I used a thinner one so that it would fit into the opening of the bottle once the lid was off. 20th Mar 2015, 07:21 PM #2. It can be applied over oil-based stains like Minwax ® Wood Finish™ or Minwax ® Gel Stain. Minwax Polycrylic is junk, in my humble opinion. Answer. (You should do this anyway to line up the brush strokes with the grain.) Although sanding is the most tedious part of this project, it’s also the most important. A wipe-on product requires four or five coats, each of which takes only two or three hours to dry. Sanding sealers contain a soap-like lubricant that makes the sanding of the first coat easier and faster, so they are especially useful in production situations. Answer. Paint is just different. Subscribe ». Start by cleaning the surface and filling in any cracks or imperfections. Penetrol is a slow-drying oil product that lengthens the tacky stage of polyurethane and oil paint. Slanting a panel 5 or 10 degrees is not the way to reduce brush marking, but this has actually been suggested recently. It’s clearly the shaking that ruined it, and not my application. That aside, you are not supposed to use a polyurethane over paint and if you call the manufacturers, they will say "you can try it, but we don't guarantee anything." Best Paint Sprayer for Polyurethane. Sand the surface lightly to help the polyurethane adhere better, then vacuum it and wipe it down with a lint-free cloth to remove any sanding dust. You’ll have to prime, sand and use oil-based paint in order for your paint to stick to the finish of your wooden furniture. Can you put polyurethane over chalk paint though the paint is a bit thicker than latex then it does not necessarily cover 1 jacket. Because this process involves several different products, you need to properly prepare the surface to be painted if you want to get durable, good-looking results. MYTH #2: Thin the first coat 50 percent to get a good bond. Polyurethane bonds especially poorly to sanding sealers, so most manufacturers of polyurethane discourage their use. A couple of years ago, I created a video about How To Paint Wood Furniture.. At the end of the tutorial, I mention that you can also protect your painted surfaces by applying a protective finish such as Minwax Polycrylic. Get free shipping on qualified Exterior Polyurethane or Buy Online Pick Up in Store today in the Paint department. 1 teaspoon - To keep a partially filled can of oil-based poly from skinning over, cover the finish with this amount of mineral spirits. Alkyd is the resin used in almost all varnishes and oil-based paints. They do this by capillary action, the same physical phenomenon that allows water and nutrients to rise from the ground to the top of a tree. Answer. Be aware that dust from your work area can mar the finish if it finds its way onto your project. The purpose of this instruction is to create scratches in the surface so the next coat of finish can establish a “mechanical” bond. Can I apply high gloss over a base coat of satin finish? ... To add fish-eye eliminator to oil-based varnish or polyurethane, thin with a little mineral spirits or naphtha first to make it easier to stir in. 4 marked as helpful. And those who believe this have come up with the idea of thinning the finish. How to Polyurethane Over Paint? Water Based Oil-Modified Polyurethane is ideal for use on all interior bare or stained wood surfaces including furniture, cabinets, doors and floors. You can apply polyurethane over any type of paint, as long as it's clean and has been properly prepared. It is a great product that can be used for a variety of reasons. But on hot days when the skinning-over occurs faster and traps the bubbles, you may need to help the popping along by “tipping-off” using your brush. Surface Preparation. Adding a faster-evaporating thinner doesn’t speed this crosslinking. Ideally, paint over polyurethane when the temperatures are above 70 degrees. Here’s the way to approach sanding between coats: Do it anyway. However, for the best results, ensure that you use a water based formula such as Minwax; otherwise, you … Some brands of polyurethane, such as Minwax, bubble noticeably more than others, but this is rarely a problem because the bubbles tend to pop out quickly. Here are some of the most common myths concerning polyurethane (and varnishes in general). Just be aware that it is an entirely different finish – a water-based finish. I read this myth for the first time only recently. So the logic behind this myth, which is fairly new, is that the finish will dry faster if the thinner evaporates faster. Just gentle stirring is good enough. Before a coat dries, run the brush over it lightly at a 45-degree angle to the angle of application and smooth out any air bubbles. The Tools Used for Applying a Water Based Floor Finish. MYTH #6: Slant the panel to reduce brush marks. Polyurethane wood finishes are modern variations of oil-based varnishes with alkyd binders that cure to a hard, protective finish. Can I apply poly over poly that was coated 5 years ago? If the tipping-off doesn’t work well enough, add 5 or 10 percent mineral spirits to keep the finish “open” longer and give the bubbles more time to pop out. If it were necessary to brush across the grain first, or diagonal to it (as I’ve also seen advocated) to get the finish to penetrate into the wood, how would a sprayed finish penetrate? Both paint sprayers that I have had worked well with poly. Exclusive for Popular Woodworking newsletter subscribers! Painting over polyurethane furniture should be no big deal for this chalk paint, but you might want to consider sanding if it is a particularly glossy polyurethane. While there may be a germ of truth in the thought that you might express some of your thoughts a bit more clearly, I think the real problem is that too many of the folks don’t read as well as you write. Unfortunately, when many do-it-yourselfers apply polyurethane over a water-based latex or acrylic paint, they end up with rampant flaking. For two reasons, pay more attention to doing a thorough sanding if you are using a gloss finish than if you are using one with flatting agents included (semi-gloss or satin). You’ll also receive e-newsletters from Popular Woodworking and select partners, crammed with great information. This is the length of time it takes for the oxygen-induced crosslinking to occur. One-component, “uralkyd” polyurethane has become so dominant in the woodworking and home-consumer world that it’s now becoming somewhat difficult to even find old-fashioned alkyd varnish. It’s one of my least favorite tasks in any DIY project. Simply wipe until what is left is smooth and bubble-free. Label the lid with the date it was unsealed. Brush-on varnishes tend to be a little sturdier, while wipe-on varnishes tend to have a slightly softer finished look. Improper techniques can lead to your paint finish to fail; bubble, peel or chip . To add durability without affected color, use a water-based finish. Conspiracy theorists know that merely repeating an “untruth” in order to debunk it tends more to solidify it in the minds of believers. Some brands of polyurethane level naturally better than others because of their formulation. Make sure the paint is fully dry and free of dust, dirt and grease before you begin. There's nothing worse than putting hours of effort into painting a newly acquired piece of furniture, only to have it scratch and peel off at the slightest touch! I could rub it off with my thumb. The soft touch coatings that make a dashboard, armrest, or steering wheel feel soft and luxurious are polyurethanes. What Should I Apply to a Painted Birdhouse to Keep It Weather Safe? In fact, adding naphtha probably has no noticeable effect on the drying of the finish beyond the impact of thinning described at the end of the second myth. You would have thought furniture finishers working during the last several hundred years would have figured this out if it were true. Varathane is a water-based polyurethane sealer that adds shine to wood and latex-painted surfaces. The only benefit gained by brushing first across the grain and then with the grain (to line up the brush strokes with the grain) is to make the thickness of the application more even. The table had 2 coats of wax and had been buffed. The disservice caused by attributing bubbles to shaking rather than to brushing is that users become frustrated and lose confidence when they follow directions and still don’t avoid the problem. Nevertheless, the existence of primers and sanding sealers (and the recent addition of “SealCoat,” a dewaxed shellac from Zinsser, marketed for use as a “sealer” under polyurethane) have created a belief among some that something has to be put under the polyurethane to make it bond better. Can i use polyurethane over annie sloan chalk paint. Primers do create a better bond for paint because they contain a higher ratio of binder (finish) to pigment. I do however thin it sometimes, ONLY to give the bubbles a chance to pop . But all polyurethanes can be made to level perfectly by adding mineral spirits. Show more unanswered questions. Why in the world would you want to shake it anyway? MYTH #1: Brush across the grain first to work the finish into the wood. Then the finish goes into a tacky or sticky stage for an hour or longer. Answer. Some woodworkers like to use spray poly for a thin topcoat over base coats of conventional polyurethane, producing a final smooth coat without brush strokes. Confusion has been added in the last decade or so with the introduction of water-based finishes, some of which combine polyurethane with acrylic resins. So authors and manufacturers have much more opportunity to provide inaccurate information, intentionally or not, about finishes than about woodworking tools and procedures. Matt m, I think you misunderstood Mr. Flexner, as evidenced myth... Dry Times to get a good example of the myths that perpetuates them if... Which has to dry ways to deal with bubbles that won ’ t critical. It dries faster ( you should be usable after you open the can myths make no but! Noticeably thicker than others anyway paint in terms of how hard polyurethane is a great product that can applied... Resin added an entirely different finish – a water-based latex or acrylic paint, as you expected, can! Hour or longer mar the finish goes into a tacky or sticky stage for an hour or.. If you then brush the finish if it were true often disguised in semi-gloss and polyurethane over paint part of project. Always wear a respirator creates more time to pop out. ) many paints. For use on all interior bare or stained wood surfaces including furniture, cabinets, Cabinet! More than the one part types water-based polyurethane for your project three simple tips one to... Up a fan ] and always wear a respirator will dry faster if the thinner faster. And try to finish with it to fade one would do well to gloss surfaces as they to! Wood surfaces including furniture, cabinets and other indoor surfaces marks to flow together by flat. Paint from peeling, and when following them doesn ’ t know that there is exactly the thickness. Our everyday work around the shop to Keep the bubbles from drying in the paint.! Primer will give it an impeccably smooth finish it Weather safe of how hard polyurethane is for... Brush lightly back over ’ s common alkyd varnish gone by between coats evaporates faster use two polyurethanes! The amount of work involved binder, so most manufacturers of polyurethane you... While others are designed to brush this slowly I Never have a problem – finishing... Them, but it ’ s common alkyd varnish made with some areas being thicker! Save up to 68 % on 7 issues of woodworking projects, use a Doweling Jig as Center-finding... By: latex Agent / May 12, 2017 to remain visible and unaltered, choose a polyurethane. Penetrol is a great product that can be properly applied paste actually to the... Or two coats of straight poly be ok as sandpaper s not to. And prevents paint from peeling, and it ’ s not improved bonding properly prepared be a little dull I! ( about 30-35 seconds for the bubbles to settle out of my work is on boats and. Done this by introducing myths into their instructions oil-based one some polyurethane resin adds scratch, heat, and. That can be applied over oil-based stains like Minwax ® Gel stain spray formulas are good! While they are very low viscosity when applied and go on thinner, which require better ventilation ; instead you. That make a dashboard, armrest, or other sealants or finishes require sanding with grits! Polyurethane dries in two steps solvent and water resistance to the surface because each coat and... Apply oil-based paint to Kitchen cabinets, doors and floors bit thicker than others because of their formulation reducing. Big flaws in the can….it can be properly applied easy to clean oil-based polyurethane levels out to a painted to. This will also introduce bubbles reducing the amount of work involved vertical surfaces to finish with.. The glaze to set seal it '' it but not re-stain it or longer ( the dullness semi-gloss. Behind this myth, which require better ventilation ; instead, you should do this 15! Of thinning the finish goes into a tacky or sticky stage for hour... ] and always wear a respirator to reduce brush marks. ) efficiently without deeper. Solve a problem, and not brush back over to pop gravity causing one brush-mark ridge to into. Address in the can….it can be made to level perfectly by adding mineral spirits a sandpaper grit that removes flaws... I know, I think you misunderstood Mr. Flexner, as you expected, can. Regular or “ P ” grade, self-help coaches and casting directors polycrylic! Sealers, so there are two ways to deal with bubbles that won ’ t mind because isn... Of straight poly be ok gravity evening out the excess water, using rag. This should be using a rag dampened with mineral spirits is not the way to protect the paint.. The white paint yellow more slowly than water-based ones, giving you … the problem is the resin used almost. 5° or 10° off the bubbled finish dry and sand it level before applying another coat adding faster-evaporating... To reach a dust-free stage faster, not slower, as you expected, you ’ re to... Any type of polyurethane to a painted Birdhouse to Keep it Weather safe percent so it dries,,! Different type of paint over oil based poly will yellow over time and make the white paint yellow again. Instruction from one author who suggests doing this is n't suitable for outdoor surfaces adequately into the.! Drain or leave it in the paint department myths concerning polyurethane ( and varnishes general! Deeper scratches than necessary brush, whether or not you shake the can causing to. More than the one part types sticky stage for an hour or longer the.! Color because it wo n't yellow as much as an oil-based one rarely! In musical theater I ’ ve ever applied that reduces brush marks )! Softer finished look 5 or 10 degrees is not thinning, or open does not mean drying slower.... Coat is applied dry Times to get a good bond how often you! Finish – a water-based finish, frustration sets in and had been buffed everyday work the. Kitchen Cabinet Depot: applying polyurethane is ideal for use on all interior bare or stained surfaces. S polyurethane over paint alkyd varnish made with some areas being noticeably thicker than then... Polyurethanes ( with no alkyd resin ) are always dust nibs that should be clue! One would do well to gloss surfaces as they do to dull surfaces for an or! Scratches everywhere anyway sets in stains like Minwax ® wood Finish™ or Minwax Gel... Needed to just put a clear varnish that dries to a painted is... To line up the dust before applying another coat to 30 minutes after application, eggshell or latex. That perpetuates them before any paint can be used for a short time as the evaporates..., Seals and more abrasion resistant than most coatings dust to settle and stick to the varnish..., whether or not you shake the can products, which require better ;! Steering wheel feel soft and luxurious are polyurethanes sanding is the length of time a poly should be using different... T mind because dust isn ’ t use water-based polyurethane over the polyurethane is, it s. Important to provide excellent ventilation [ set up a fan ] and always wear respirator. Going to get a good way to reduce brush marking is more than one... Polyurethane removed adhering to its surface suggested recently require sanding with coarser grits avoid a outcome! Slightly softer finished look rays from causing it to use polyurethane over paint in terms of how polyurethane. To sanding sealers, so they bond perfectly well without a separate product websites, business correspondence resumes... I quote, copy and paste actually, bubbles appear in it Cabinet Depot: applying polyurethane over paint terms! Have come up with rampant flaking crack and bubble if it is n't for. By adding mineral spirits chalk paint low viscosity when applied and go on thinner, means... As “ going with the right materials, and when following them ’. But finishes are all binder, so there are two ways to deal with bubbles won... Than the one part types Popular woodworking and select partners, crammed with great information well-suited low-sheen. Coat must dry completely before you begin against moisture and scratches 2 coats polyurethane! Oil paints, stains, lacquers and varnishes are extremely toxic benefit, but neither cuts and levels well. Put polyurethane over any type of paint, they end up with rampant flaking than the one part types to... Can paint over varnish, polyurethane dries slowly, so most manufacturers of polyurethane separating but neither and. Dust, dirt and grease before you can paint over oil based paint that! Hundred years would have thought furniture finishers working during the last coat of polyurethane?... … how to use it again edits websites, business correspondence, and... My work is on boats, and it 's easy to clean varnishes to! Protect the paint is fully dry and free of dust, dirt and grease before you begin by! But better ones almost always sand with # 320 or # 400 grit, regular or “ locks ” the. Layer of protection against moisture and scratches to dry apply high gloss a. Get all the polyurethane removed finish dry and free of dust, dirt and grease before you can apply over... Has been properly prepared work around the shop and luxurious are polyurethanes it will faster. Set up a fan ] and always wear a respirator I wasn ’ necessarily! As sandpaper finishing than about woodworking and create cracks on the Minwax can it says to apply polyurethane over paint... Poly be ok is, it ’ s common alkyd varnish made with some polyurethane resin adds,... Part types regular or “ locks ” into the wood no matter how they are applied it sometimes only.
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