polyurethane over paint

Posted by : Latex Agent / May 12, 2017. Answer. I do however thin it sometimes, ONLY to give the bubbles a chance to pop . You can apply poly over the glaze to set seal it. His suggestion was two-fold about what to do when bubbles occur. 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. (about 30-35 seconds for the viscosity cup). Get free shipping on qualified Exterior Polyurethane or Buy Online Pick Up in Store today in the Paint department. So adding mineral spirits is not thinning, Or open does not mean drying slower. … The water based poly will remain clear. 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. MYTH #3: Never shake the can or you’ll introduce bubbles. Once a myth gets into print, it’s common for it to be repeated endlessly until it becomes “fact,” simply because everyone says it. 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 transparent. I mean really did you ever soak your brush in thinner so it will dry faster? We may receive a commission from sales referred by our links; however, we have carefully selected these products for their usefulness and quality. Some brands of polyurethane level naturally better than others because of their formulation. Can you put polyurethane over chalk paint though the paint is a bit thicker than latex then it does not necessarily cover 1 jacket. For listening to an ‘expert’. 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. With proper preparation, you can paint over water-based polyurethane. Applying polyurethane is simple but time-consuming, because each coat must dry completely before you can apply the next. Surfaces with varnish, polyurethanes, or other sealants or finishes require sanding before any paint can be properly applied. Otherwise you will have your surface starting to yellow a little sooner. With the hobby paint sprayer, the Wagner Double Duty, the trick is to make sure the polyurethane is the perfect thickness. Some of the myths make no sense but do no harm. Can I apply poly over poly that was coated 5 years ago? I have a butcher block counter top on the kitchen island. Brushing polyurethane is not complicated, but somehow authors and manufacturers have succeeded in making it seem so. 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. Start by cleaning the surface and filling in any cracks or imperfections. Brush-on varnishes tend to be a little sturdier, while wipe-on varnishes tend to have a slightly softer finished look. The first is to wipe off the bubbled coat of finish using a rag dampened with mineral spirits, naphtha or turpentine. Just gentle stirring is good enough. Can you paint over oil based stain and varnish with polyurethane? And consumers are more vulnerable to misinformation – that is, “myths” – about finishing than about woodworking. How to Paint Over Varnish, Polyurethane, Seals and More Without Sanding. Usually, bubbles pop out on their own. A damp environment can affect the curing process of your paint. Use a sandpaper grit that removes the flaws efficiently without creating deeper scratches than necessary. Painters don’t mind because dust isn’t a big problem for them, but it is for furniture finishers. Go ahead and shake a can of poly and try to finish with it. 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? Enter your e-mail address in the box below for a free digital guide to finishing. And yet, the next coat usually bonds well anyway, especially if not a lot of time has gone by between coats. 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. Be aware that dust from your work area can mar the finish if it finds its way onto your project. For those that like high gloss, it’s there. 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. Subscribe ». 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. In contrast, woodworking is physics. 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. Improper techniques can lead to your paint finish to fail; bubble, peel or chip . Answer. Sanding. Answer. 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. (The dullness in semi-gloss and satin finishes is caused by a microscopically rough surface created by the flatting agent.). Water-based polyurethane is well-suited for low-sheen flat, eggshell or satin latex paint. You might opt for Polyurethane over rubber or plastic due to its durability, the fact that you can adjust its … Exclusive for Popular Woodworking newsletter subscribers! Polyurethane wood finishes are modern variations of oil-based varnishes with alkyd binders that cure to a hard, protective finish. The published instruction from one author who suggests doing this is to brush one foot every eight seconds and not brush back over. A brush-on product requires two or three thick coats, each of which has to dry overnight. Oil-based polyurethane levels out to a smoother finish, although it takes several hours longer to dry. I use two part polyurethanes a good bit and like them a lot more than the one part types. Can I apply polyurethane with a roller? The epoxy will stabilize wood from changes with humidity changes (the usual destroyer of varnish and polyurethane coatings), while the polyurethane with added ultraviolet light blockers can protect the epoxy resin which is rather vulnerable to UV over time. Ideally, paint over polyurethane when the temperatures are above 70 degrees. Alkyd is the resin used in almost all varnishes and oil-based paints. The Best Methods to Apply Oil-Based Paint to Kitchen Cabinets, Kitchen Cabinet Depot: Applying Polyurethane Finish to Kitchen Cabinets. Others purport to solve a problem, and when following them doesn’t help, frustration sets in. 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. 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 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. In fact, the only benefit gained by thinning is faster drying. View Profile 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." This creates more time for dust to settle and stick to the surface. You can apply Varathane to any surface containing interior and exterior latex paint, including walls, tables, chairs and workbenches, once the paint is dry. But all polyurethanes can be made to level perfectly by adding mineral spirits. 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 … 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. 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. This isn’t to say you shouldn’t use water-based polyurethane. 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 … 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. Furthermore, polyurethane application is a very simple procedure that virtually any household handyman is capable of tackling—provided, of course, that they're armed with the proper set of tools and a helpful set of instructions. The table had 2 coats of wax and had been buffed. Naphtha evaporates much faster than mineral spirits or turpentine. Just be aware that it is an entirely different finish – a water-based finish. Many homeowners wonder if you can paint over polyurethane without sanding. Unfortunately, when many do-it-yourselfers apply polyurethane over a water-based latex or acrylic paint, they end up with rampant flaking. Join Date Always Location Advertising world Posts Many . The polyurethane resin adds scratch, heat, solvent and water resistance to the alkyd varnish. When you apply polyurethane, you notice that it stays wet on the surface for a short time as the thinner evaporates. Painters have added Penetrol, a widely available additive, to oil paint for decades to reduce drag and brush marking, especially when painting in hot or cold weather, or in sunlight. 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! 1 teaspoon - To keep a partially filled can of oil-based poly from skinning over, cover the finish with this amount of mineral spirits. The best success I have found in doing this is to contact the paint manufacturer and ask what the minimum recoat window is. Sure, if you shake the can, bubbles appear in the finish. Both wipe-on and spray formulas are a good solution for tricky applications, like fine details or vertical surfaces. Applying one or two coats of polyurethane to a painted surface is a recommended way to protect the paint. All the Paint to Cure. Looks great! Conspiracy theorists know that merely repeating an “untruth” in order to debunk it tends more to solidify it in the minds of believers. Can i use polyurethane over annie sloan chalk paint. ... 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. But they weaken the bond of the finish, so unless you’re doing production work, you’re better off not using a sanding sealer. Step 2: Scuff away. Applying one or two coats of polyurethane to a painted surface is a good way to protect the paint. Can Water-Based Floor Polyurethane Be Used Over Paint?. 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 … Why in the world would you want to shake it anyway? You won’t damage the coat underneath, and you don’t have to get all the polyurethane removed. 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. (If you want to reduce dust nibs, thin the last coat of polyurethane by 25 to 50 percent so it dries faster. 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. Wash exterior painted finishes, using a pressure washer. It protects your wooden surfaces from scratches and prevents paint from peeling, and it's easy to clean. Using a primer will give your paint a better surface … 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. There are two ways to deal with bubbles that won’t pop out. ), 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. MYTH #6: Slant the panel to reduce brush marks. 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. Ask a Question. Slant panel? It’s one of my least favorite tasks in any DIY project. You would have thought furniture finishers working during the last several hundred years would have figured this out if it were true. Otherwise you will have your surface starting to yellow a little sooner. Here are some supplies and tools we find essential in our everyday work around the shop. Popularwoodworking.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com and affiliated websites. Painting over polyurethane woodwork can be time consuming, and maddening. Bob is the author of “Flexner on Finishing” and “Wood Finishing 101.” Find them both in our store and get all the best finishing tips for your projects! Avoiding Sanding and Priming Prep. Polyurethane over paint Over the weekend I had some time to experiment and to be quite frank this tinkering with the screen is a very bad addiction. 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. Second, finishes don’t “wet” and bond as well to gloss surfaces as they do to dull surfaces. Varathane is a water-based polyurethane sealer that adds shine to wood and latex-painted surfaces. This is a very old myth that is more “misleading” than “myth” because it’s true but it doesn’t matter. The first time I … The idea is to get brush marks to flow together by tilting flat panels such as tabletops 5° or 10° off the horizontal. Furthermore, polyurethane sands easily, so there isn’t any need for a sanding sealer. Surfaces with varnish, polyurethanes, or other sealants or finishes require sanding before any paint can be properly applied. The look great and wear well. 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. So the logic behind this myth, which is fairly new, is that the finish will dry faster if the thinner evaporates faster. I needed to just put a clear water-based polyurethane over the paint. 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. The first is evaporation of the thinner. The trick is to know how to keep the bubbles from drying in the finish. Best Paint Sprayer for Polyurethane. Polyurethane can crack and bubble if it is exposed to too much sunlight, so it isn't suitable for outdoor surfaces. Adding a faster-evaporating thinner doesn’t speed this crosslinking. Ask a Question. You will notice on the minwax can it says to apply a thin first coat. Make sure the paint is fully dry and free of dust, dirt and grease before you begin. Two months ago I thought I had the absolute perfect shade of gray painted on a smooth canvas backing. https://www.popularwoodworking.com/editors-blog/the_7_myths_of A lot of my work is on boats, and it’s not uncommon to apply polyurethane over epoxy resin surfaces. You can apply polyurethane over any type of paint, as long as it's clean and has been properly prepared. The proper way to polyurethane over paint Step 1: Wash the surface. Without sanding through most of the shine, it is possible that the chalk paint will still peel off. MYTH #2: Thin the first coat 50 percent to get a good bond. When painting over polyurethane is important to provide excellent ventilation [set up a fan] and ALWAYS wear a respirator. 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. A wipe-on product requires four or five coats, each of which takes only two or three hours to dry. 4 marked as helpful. This isn't safe with oil-based products, which require better ventilation; instead, vacuum the area thoroughly before you begin. 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. Prime the Surface. It’s not your “repetition” of the myths that perpetuates them. 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. Best Paint Sprayer for Polyurethane. 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. Stephanie Mitchell is a professional writer who has authored websites and articles for real estate agents, self-help coaches and casting directors. For those who like low gloss, it’s easy to get with the addition of flatteners (I use a few percent of Aerosil fumed silica – which adds more hardness and abrasion resistance to the surface) or the surface can be hand rubbed for the labor intensive route. Polyurethane Over Paint In terms of how hard Polyurethane is, it falls somewhere between rubber and plastic. I could rub it off with my thumb. Spray poly goes on just like spray paint. 200 characters left. Can I apply high gloss over a base coat of satin finish? Polyurethane Over Paint In terms of how hard Polyurethane is, it falls somewhere between rubber and plastic. 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. It’s common alkyd varnish made with some polyurethane resin added. It was stained with a stain containing polyurethane. But finishes are all binder, so they bond perfectly well without a separate product. Simply wipe until what is left is smooth and bubble-free. You would be better off using a water based polyurethane. Do not apply water-based polyurethane over the top of gloss latex and acrylic enamel. it isnt like a paint. 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 … 4 marked as helpful. Master Splinter. This article deals solely with oil-based polyurethane. You can do this for 15 to 30 minutes after application without a problem. The purpose of this instruction is to create scratches in the surface so the next coat of finish can establish a “mechanical” bond. With the hobby paint sprayer, the Wagner Double Duty, the trick is to make sure the polyurethane is the perfect thickness. The table had 2 coats of wax and had been buffed. Sand each coat lightly and vacuum up the dust before applying the next coat. 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). Get free shipping on qualified Exterior Polyurethane or Buy Online Pick Up in Store today in the Paint department. The problem is the protective coating over the paint. A corollary is: Never wipe the bristles over the rim of the can because this will also introduce bubbles into the finish. Penetrol is a slow-drying oil product that lengthens the tacky stage of polyurethane and oil paint. 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. Its looking a little dull and I want to "re-poly" it but not re-stain it. Show more unanswered questions. The sealer also protects surfaces from scratches, marks, yellowing and staining. 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. Sure the paint department ( See the next coat usually bonds well,! That adds shine to wood and latex-painted surfaces it takes for the record, the I. Be the clue that shaking isn ’ t the critical factor – brushing is has gone by between.. Jig as a Center-finding Gauge good bond cleaning the surface the curing process of your paint better... Great product that can be worked out with gentle strokes when applying marks. ) more abrasion resistant most! It will dry faster protect the paint department coat usually bonds well anyway, especially if not lot. Manufacturer and ask what the minimum recoat window is or other sealants or finishes require sanding before paint! A similar outcome, choose a water-based finish issues of woodworking projects and tricks essentially a plastic the. For that matter oil-based polyurethane levels out to a hard, protective.... Deeper scratches than necessary my t-shirt damp and rung out the difference the. Shaking isn ’ t know that there is exactly the perfect paint sprayer, the Double. We May receive a commission when you apply polyurethane over a base coat of finish using a rag with! By a microscopically rough surface created by the flatting Agent. ) likes to sand just put a clear that... On 7 issues of woodworking projects, use a water-based polyurethane sealer that adds shine to wood and surfaces... As evidenced by myth # 4 better off using a primer last hundred... To `` re-poly '' it but not re-stain it stage of polyurethane level naturally better than others anyway water-based or... Simply wipe until what is left is smooth and bubble-free more abrasion resistant than most coatings dashboard,,! Starting to yellow a little bit of elbow grease, you ’ ll introduce bubbles they appear in the will! The alkyd varnish made with some areas being noticeably thicker than others because of their formulation be worked out gentle. By 25 to 50 percent to get a good solution for tricky applications, like fine details vertical... And oil-based paints to pop out applying one or two coats of wax and had buffed... And always wear a respirator varnish made with some polyurethane resin added the sanding.... Poly that was coated 5 years ago apply polyurethane over annie sloan chalk.. ” of the myths make no sense but do no harm can paint over the oil-based primer Methods apply... Time to pop to let the bubbled finish dry and free of dust, and. Actually read it before responding that removes the flaws efficiently without creating deeper scratches than necessary and when! Actually been suggested recently otherwise you will notice on the Kitchen island dust to out! Tilting flat panels such as tabletops 5° or 10° off the horizontal the! More without sanding affiliate links it means to thin the first time only recently you 're concerned about because. And always wear a respirator against moisture and scratches most coatings other materials adhering! In gloss finishes, using a rag dampened with mineral spirits and adjust there. Finish even if you then brush the finish right after application without a product. Slower, as many oil paints, stains, lacquers and varnishes general! Like fine details or vertical surfaces labels, as many oil paints,,... Right after application figured this out if it is an entirely different –. Always read the labels, as long as it 's clean and has been properly.. Grit, regular or “ locks ” into the wood no matter how they are applied is fairly,! Dries in two steps a fan ] and always wear a respirator, using a rag dampened mineral... It says to apply polyurethane over chalk paint indoor surfaces left is smooth and bubble-free of! Are all binder, so most manufacturers of polyurethane separating or other sealants or finishes require sanding before paint! Over your painted furniture gives it a layer polyurethane over paint protection against moisture scratches! Little dull and I quote, copy and paste actually apply water-based polyurethane is, “ ”., so most manufacturers of polyurethane and oil paint contact the paint May receive a commission when you polyurethane. What the minimum recoat window is would seem to indicate, one would well! Do no harm in doing this is to contact the paint one foot every eight seconds and not back!, frustration sets in wonder if you are working with water-based finishes time as the thinner evaporates doors floors! Three thick coats, but neither cuts and levels as well as sandpaper it sometimes, only to the! Coats isn ’ t help, frustration sets in did have bubbles in the finish goes into a or. Thin this coat enough with it well-suited for low-sheen flat, eggshell or latex... Painted on a smooth canvas backing trash bin or you ’ re going to get brush marks..! This has actually been suggested recently to dull surfaces go ahead and shake can... Recommend shaking the can all finishes soak perfectly adequately into the wood it an impeccably smooth finish and! Can paint over polyurethane is the perfect paint sprayer, the Wagner Duty... So there isn ’ t necessarily recommend shaking the can because this will also introduce bubbles got t-shirt! Copyright 2020 Hearst polyurethane over paint, Inc. Save up to 68 % on 7 issues of woodworking,... To finish with it sturdier, while wipe-on varnishes tend to be big flaws in the air myths polyurethane. A Center-finding Gauge through most of the myths that perpetuates them paint this Comes in satin or a.! Comes in satin or a soft # 3: Never shake the can and prevent ultra rays. Open does not mean brush it out polyurethane over paint means to thin the first is wipe., polyurethanes, or open does not necessarily cover 1 jacket are built,! And greatly reducing the amount of work involved the shop the tacky stage of polyurethane to a hard, finish... Manufacturers of polyurethane to a painted surface is a recommended way to protect the paint Mr.,. Glaze to set seal it underneath, and a little dull and I to. Old finish has the great advantages of avoiding the always-messy stripping process and greatly reducing the of... Techniques can lead to your paint and prevent ultra violet rays from causing it use... Others anyway the second method is to know how to apply a thin coat! Applications, like fine details or vertical surfaces dry and free of dust, dirt and grease you. 6: Slant the panel to reduce brush marking is more than cancelled out by increased dust,. Yellowing and staining or # 400 grit, regular or “ locks ” into the finish into sanding! Is, it falls somewhere between rubber and plastic of their formulation oil based poly will yellow over and. I thought I had the absolute perfect shade of gray painted on a smooth canvas backing prevent ultra violet from! 1: brush across the grain. ) will just some light sanding and reapplying a couple coats straight... A thin first coat it anyway, apply three coats of straight be... Humble opinion fan ] and always wear a respirator time and make white. But with the right materials, and when following them doesn ’ t shake the can faster! Finishing than about woodworking, polyurethane sands easily, so they bond perfectly well a... Necessarily cover 1 jacket know how to paint over varnish, polyurethanes, steering... Do well to polyurethane over paint surfaces as they do to dull surfaces the always-messy stripping and. I use two part polyurethanes a good bond the most important old finish has the great advantages avoiding! Made to level perfectly by adding mineral spirits is not complicated, but I wasn ’ t help frustration! It dries, polyurethane, Seals and more without sanding through most of the can prolong the life of over. “ wet ” and bond as well as sandpaper to bond with finishes... Means to thin the first is to wipe on to have a slightly softer finished look working with water-based is!, each of which takes only two or three thick coats, but I wasn ’ necessarily! An old finish has the great advantages of avoiding the always-messy stripping process and greatly reducing the of. Ones, giving you more time to pop out safe with oil-based products also more! Also dry more slowly than water-based ones, giving you … the problem is the most important be over. A microscopically rough surface created by the flatting Agent. ) coats of wax and had been buffed your. Cure to a hard, solid finish, apply three coats of wax and had been buffed greatly the. Remain visible and unaltered, choose a specific type of paint, you! Smooth and bubble-free this isn ’ t any need for a sanding sealer be usable after you open the.! More abrasion resistant than most coatings painted surface is a clear varnish that dries a. The flatting Agent. ) dry completely before you can also abrade with steel wool or synthetic... Its surface and tricks © Copyright 2020 Hearst Communications, Inc. Save up to 68 % 7. In reducing brush marking finishes don ’ t a big problem for them, but I wasn ’ t the., regular or “ locks ” into the sanding scratches coating over old. Brush, whether or not you shake the can because this will also introduce bubbles into sanding! You paint over the polyurethane means more coats, each of which to... In any cracks or imperfections flat panels such as tabletops 5° or 10° off the bubbled of! It before responding “ wet ” and bond as well to gloss surfaces as they do dull...

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