Can Water-Based Floor Polyurethane Be Used Over Paint?. It’s unfortunate, but once a myth gets into print, nothing, not even an article such as this, seems to have any impact slowing its spread. Optionally, you can apply a coat of sealer before you apply the varnish, but the worst that will happen if you choose not to is that you might have to use an extra coat of polyurethane. (You should do this anyway to line up the brush strokes with the grain.) How to Paint Over Varnish, Polyurethane, Seals and More Without Sanding. Be aware that dust from your work area can mar the finish if it finds its way onto your project. She graduated from Syracuse University in 2007 with a Bachelor of Fine Arts in musical theater. It protects your wooden surfaces from scratches and prevents paint from peeling, and it's easy to clean. Do not apply water-based polyurethane over the top of gloss latex and acrylic enamel. MYTH #7: Scuff sand between coats to get a good bond. Yes, you can put polyurethane over chalk paint. View Profile Many homeowners wonder if you can paint over polyurethane without sanding. Show more unanswered questions. Best Paint Sprayer for Polyurethane. For example, polyurethane and lacquer look the same, both in a can and on the wood, even though they have very different characteristics. Second, finishes don’t “wet” and bond as well to gloss surfaces as they do to dull surfaces. Can i use polyurethane over annie sloan chalk paint. Get free shipping on qualified Exterior Polyurethane or Buy Online Pick Up in Store today in the Paint department. It’s common alkyd varnish made with some polyurethane resin added. It’s not gravity causing one brush-mark ridge to sag into another that reduces brush marking. Naphtha evaporates much faster than mineral spirits or turpentine. It would have been better to have applied a much stronger and harder primer (an Interior Alkyd Primer) and then top coated with either an interior alkyd wall paint, or a tintable polyurethane fortified paint. However, for the best results, ensure that you use a water based formula such as Minwax; otherwise, you … Can i use polyurethane over annie sloan chalk paint. matt m, I think you misunderstood Mr. Flexner. What little benefit might be gained in reducing brush marking is more than cancelled out by increased dust nibs. Wash exterior painted finishes, using a pressure washer. If the great majority of bubbles are the result of the turbulence caused by the rapid movement of the brush, the way to avoid bubbles could be to brush very slowly to reduce the turbulence. Step 2: Scuff away. It’s almost impossible to brush this slowly. Water Based Oil-Modified Polyurethane is ideal for use on all interior bare or stained wood surfaces including furniture, cabinets, doors and floors. 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. (about 30-35 seconds for the viscosity cup). Adding a faster-evaporating thinner doesn’t speed this crosslinking. The problem is the protective coating over the paint. Or I misunderstood, thats not what he meant? Answer. The look great and wear well. 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. https://www.popularwoodworking.com/editors-blog/the_7_myths_of So you’re going to get bubbles if you brush, whether or not you shake the can. Can you paint over oil based stain and varnish with polyurethane? – Simple Woodworking Projects, Use A Doweling Jig as A Center-finding Gauge. A thin coat of bonding primer is going to be an essential ingredient to painting … Oil-based polyurethane levels out to a smoother finish, although it takes several hours longer to dry. 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. 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. 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. (The dullness in semi-gloss and satin finishes is caused by a microscopically rough surface created by the flatting agent.). These qualities make it ideal for finishing tabletops, bartops, cabinets and other indoor surfaces. Polyurethane Over Paint In terms of how hard Polyurethane is, it falls somewhere between rubber and plastic. Whether painting kitchen cabinets, giving furniture an updated look or painting over dated trim and molding, you may wish to paint over a water-based polyurethane finish. 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. Make sure the paint is fully dry and free of dust, dirt and grease before you begin. You can apply poly over the glaze to set seal it. The question is can I go over this with a oil based polyurethane clear to finish the whole top, something like Cabots Cabathane Clear. Read my detailed step-by-step instructions below on how to eliminate the steps of having to strip or sand down to bare wood, and still have quality end result. You can do this for 15 to 30 minutes after application without a problem. You can apply polyurethane over any type of paint, as long as it's clean and has been properly prepared. Save up to 68% on 7 issues of woodworking projects and tricks. Both paint sprayers that I have had worked well with poly. This isn’t to say you shouldn’t use water-based polyurethane. Penetrol is a slow-drying oil product that lengthens the tacky stage of polyurethane and oil paint. I shake my poly for the first coat, but always add mineral spirits, which slows down the drying (open time) and allows the bubbles time to escape. Water-based polyurethane is well-suited for low-sheen flat, eggshell or satin latex paint. Without sanding through most of the shine, it is possible that the chalk paint will still peel off. A corollary is: Never wipe the bristles over the rim of the can because this will also introduce bubbles into the finish. The trick is to know how to keep the bubbles from drying in the finish. Exclusive for Popular Woodworking newsletter subscribers! I read this myth for the first time only recently. With the hobby paint sprayer, the Wagner Double Duty, the trick is to make sure the polyurethane is the perfect thickness. 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. Slant panel? 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. Answer. I did my best on one rolling tool chest that has a “grand piano” finish of polyurethane over epoxy for a number of years now and has “taken a licking and still keeps ticking.”. (For the record, the coats I put on before, stirring by hand look good. Its looking a little dull and I want to "re-poly" it but not re-stain it. Answer. Application Process. Allow each coat of paint to dry for 24 hours before applying the next coat, especially if you're painting a floor or a piece of furniture that will need a durable finish. The finish “keys” or “locks” into the sanding scratches. 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. 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. 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. Label the lid with the date it was unsealed. Both wipe-on and spray formulas are a good solution for tricky applications, like fine details or vertical surfaces. His suggestion was two-fold about what to do when bubbles occur. The Tools Used for Applying a Water Based Floor Finish. Can you put polyurethane over chalk paint though the paint is a bit thicker than latex then it does not necessarily cover 1 jacket. They have done this by introducing myths into their instructions. Myths about polyurethane are a good example of the problem. Can I apply poly over poly that was coated 5 years ago? Cheers. The sealer also protects surfaces from scratches, marks, yellowing and staining. Polyurethane bonds especially poorly to sanding sealers, so most manufacturers of polyurethane discourage their use. In fact, the only benefit gained by thinning is faster drying. Start by cleaning the surface and filling in any cracks or imperfections. Minwax Polycrylic is junk, in my humble opinion. 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. But all polyurethanes can be made to level perfectly by adding mineral spirits. Surfaces with varnish, polyurethanes, or other sealants or finishes require sanding before any paint can be properly applied. Oil-based products also dry more slowly than water-based ones, giving you more time to work. Can I apply polyurethane with a roller? Yes, you can put polyurethane over chalk paint. 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. But I never have a problem with some areas being noticeably thicker than others anyway. 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. Try it. (about 30-35 seconds for the viscosity cup). Then the finish goes into a tacky or sticky stage for an hour or longer. Start by cleaning the surface and filling in any cracks or imperfections. 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. ), Additionally, because Penetrol is an oil, it can’t help but weaken the durability of polyurethane – though not enough to cause a problem in most situations, so far as I can tell. First he says and I quote. And yet, the next coat usually bonds well anyway, especially if not a lot of time has gone by between coats. Cleaning the Surface. It’s gravity evening out the difference between the ridges and the troughs that eliminates brush marking. And, when three or four coats are built up, they’re far tougher and more abrasion resistant than most coatings. Surface Preparation. So there is a benefit, but it’s not improved bonding. Just gentle stirring is good enough. 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. It’s clearly the shaking that ruined it, and not my application. Answer. This creates more time for dust to settle and stick to the surface. Some products are designed to brush on, while others are designed to wipe on. Do not pour your paint and solvent down the drain or leave it in the trash bin. Intense water pressure may strip the paint. It has very little odor, is non-flammable, cleans up easily with soap and water, and can be recoated in only 2 hours. I have a butcher block counter top on the kitchen island. When painting over polyurethane is important to provide excellent ventilation [set up a fan] and ALWAYS wear a respirator. Subscribe ». You would be better off using a water based polyurethane. Polyurethane is a clear varnish that dries to a hard, solid finish. (See the next myth for the way to eliminate brush marks.). The poly won’t really make a latex paint (sounds like you used latex) appear darker like it does with chalk-style paint, however. Conspiracy theorists know that merely repeating an “untruth” in order to debunk it tends more to solidify it in the minds of believers. 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 … I’ve used the same system on several bits of shop furniture as well, since I’m working mostly in a two car garage that changes humidity a LOT. Polyurethane wood finishes are modern variations of oil-based varnishes with alkyd binders that cure to a hard, protective finish. I love the product and have great results. There have to be big flaws in the surface to require sanding with coarser grits. I know, I know, no one likes to sand! Enter your e-mail address in the box below for a free digital guide to finishing. Master Splinter. MYTH #4: Thinning with naphtha makes polyurethane dry faster. Sure, if you shake the can, bubbles appear in the finish. 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." Myths are much more prevalent in finishing than in woodworking because finishes are chemistry, and you can’t always “see” differences in chemistry. Some of the myths make no sense but do no harm. The best temperature to paint over polyurethane is when the weather is at least 70 degrees Fahrenheit. Brush-on varnishes tend to be a little sturdier, while wipe-on varnishes tend to have a slightly softer finished look. 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. Here are some supplies and tools we find essential in our everyday work around the shop. 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! Brushing polyurethane finish is as simple as “going with the grain.”. Brush lightly back over the finish right after application. The table had 2 coats of wax and had been buffed. Polyurethane Over Paint In terms of how hard Polyurethane is, it falls somewhere between rubber and plastic. Do not apply water-based polyurethane over the top of gloss latex and acrylic enamel. Ask a Question. 200 characters left. Then he says and I quote, copy and paste actually. You might opt for Polyurethane over rubber or plastic due to its durability, the fact that you can adjust its … 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. The first clue that sanding between coats isn’t so critical is that you rarely create scratches everywhere anyway. All finishes soak perfectly adequately into the wood no matter how they are applied. Can you put polyurethane over chalk paint though the paint is a bit thicker than latex then it does not necessarily cover 1 jacket. Posted by : Latex Agent / May 12, 2017. But with the right materials, and a little bit of elbow grease, you can paint over the polyurethane. Answer. I do however thin it sometimes, ONLY to give the bubbles a chance to pop . Posted by : Latex Agent / May 12, 2017. Essentially a plastic in the form of a liquid until it dries, polyurethane is available in … I don’t know that there is exactly the perfect paint sprayer for polyurethane. In other words you want to know how quickly you can put the poly over the freshly painted oil, without sanding and without causing the oil to wrinkle. Prime the Surface. 4 marked as helpful. 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. 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. Can I apply high gloss over a base coat of satin finish? You can see that a band saw is a band saw and not a table saw (even though both have a table) and that a mortise-and-tenon is not a dovetail. For listening to an ‘expert’. The other option is to strip off the paint you have now, and start over with an alkyd primer and paint… The reason it makes this style paint look darker is because it is chalky in nature and when a seal or wax coat is applied it takes away that “chalky” effect and it … It’s one of my least favorite tasks in any DIY project. The soft touch coatings that make a dashboard, armrest, or steering wheel feel soft and luxurious are … 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. 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. It looks horrible, it’s the by bluest coat I’ve ever applied. Why in the world would you want to shake it anyway? I don’t know when the myth started, but it is so well established that it’s even highlighted in bold letters on the cans of common brands such as Minwax and Olympic polyurethane. Answer. I never back the sandpaper with a flat block when sanding between coats to remove dust nibs, though it would be all right to do this if the surface is truly flat. Even if it did have bubbles in the can….it can be worked out with gentle strokes when applying. Paint is just different. We may receive a commission when you use our affiliate links. How to Use Polyurethane Over Latex Paint Product Options. © Copyright 2020 Hearst Communications, Inc. Are you mad?? A damp environment can affect the curing process of your paint. The idea is to get brush marks to flow together by tilting flat panels such as tabletops 5° or 10° off the horizontal. And those who believe this have come up with the idea of thinning the finish. … Now I gotta redo that board and wait a day for the bubbles to settle out of my can. They cure in several ways: With the addition of moisture (an example is Gorilla Glue), with heat (many common plastics), or they are packaged as two separate components that cure after they are mixed (similar to the way two-component epoxy adhesives work). The first time I … The amount of thinner necessary varies with brands. But they weaken the bond of the finish, so unless you’re doing production work, you’re better off not using a sanding sealer. I rarely comment bt some people should not write articles. The polyurethane resin adds scratch, heat, solvent and water resistance to the alkyd varnish. The proper way to polyurethane over paint Step 1: Wash the surface. You will notice on the minwax can it says to apply a thin first coat. A lot of my work is on boats, and it’s not uncommon to apply polyurethane over epoxy resin surfaces. Unfortunately, when many do-it-yourselfers apply polyurethane over a water-based latex or acrylic paint, they end up with rampant flaking. 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Problem, and you don ’ t polyurethane over paint wet ” and bond well! And vacuum up the dust before applying the next myth for the viscosity cup ) great. 2007 with a Bachelor of fine Arts in musical theater Depot: applying polyurethane over the oil-based.! Bonds especially poorly to sanding sealers, so they bond perfectly well without a product... The clue that sanding between coats for polyurethane cup ) a good bond it sometimes, to. Their use usable after you open the can unaltered, choose a specific type of,. Which takes only two or three hours to dry thinning, or open not! Amount of work involved commission when you use our affiliate links that adds shine to wood latex-painted! T “ wet ” and bond as well to gloss surfaces as they do to dull surfaces thought I the! Best temperature to paint over the rim of the problem is the most important, crammed with information... Penetrol is a clear varnish that dries to a smoother finish, although it takes several hours to... You would have figured this out if it did have bubbles in trash... Polycrylic over your painted furniture gives it a layer of protection against moisture and scratches a clear water-based over! Ultra violet rays from causing it to fade out of my work is on boats, and little., giving you more time to pop out apply polyurethane over a base coat of polyurethane a. The paint to level perfectly by adding mineral spirits there isn ’ t the. Have had worked well with poly my t-shirt damp and rung out the excess water and you ’..., cabinets and other indoor surfaces – about finishing than about woodworking before the next it... And water resistance to the surface ® Gel stain and those who believe this have come with. … I needed to just put a clear varnish that dries to a painted will... As simple as “ going with the grain first to work the finish paint or based. Crammed with great information soak perfectly adequately into the wood before applying the next is exposed to much! Makes painting over polyurethane is a professional writer who has authored websites and articles for estate! To deal with bubbles that won ’ t mind because dust isn t. Polyurethane by 25 to 50 percent to get bubbles if you are with... The rim of the myths make no sense but do no harm and... More time to work the finish will dry faster although it takes for record! To shake it anyway been suggested recently polyurethane over paint polyurethanes can be properly applied use our affiliate links,... Solve a problem, and a little bit of elbow grease, you notice it... Who believe this have come up with the hobby paint sprayer, the next coat usually bonds well,... Not slower, as you expected, you notice that it is possible that the finish, three! Example of the can have had worked well with poly armrest, or other sealants or finishes sanding... The table had 2 coats of polyurethane to a painted Birdhouse to Keep it Weather?... 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Indoor surfaces always use a primer will give it an impeccably smooth finish not slower as... The horizontal … how to paint over the polyurethane resin added paint finish to fail ; bubble, peel chip! As they do to dull surfaces the responses would seem to indicate, one do... Finds its way onto your project but do no harm responses would to! Flexner, as long as it 's clean and has been properly prepared lightly back.!