Can I apply poly over poly that was coated 5 years ago? First, even tiny flaws show in gloss finishes, while they are often disguised in semi-gloss and satin. Once a myth gets into print, it’s common for it to be repeated endlessly until it becomes “fact,” simply because everyone says it. Probably the opposite, in fact. In fact, the only benefit gained by thinning is faster drying. Do not apply water-based polyurethane over the top of gloss latex and acrylic enamel. But they weaken the bond of the finish, so unless you’re doing production work, you’re better off not using a sanding sealer. Otherwise you will have your surface starting to yellow a little sooner. ", 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! Mitchell also regularly edits websites, business correspondence, resumes and full-length manuscripts. Improper techniques can lead to your paint finish to fail; bubble, peel or chip . When painting over polyurethane is important to provide excellent ventilation [set up a fan] and ALWAYS wear a respirator. Posted by : Latex Agent / May 12, 2017. 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. So the logic behind this myth, which is fairly new, is that the finish will dry faster if the thinner evaporates faster. … Brushing polyurethane is not complicated, but somehow authors and manufacturers have succeeded in making it seem so. 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! matt m, I think you misunderstood Mr. Flexner. And if you then brush the finish, bubbles appear in it. Can you put polyurethane over chalk paint though the paint is a bit thicker than latex then it does not necessarily cover 1 jacket. Go ahead and shake a can of poly and try to finish with it. Start by cleaning the surface and filling in any cracks or imperfections. When you apply polyurethane, you notice that it stays wet on the surface for a short time as the thinner evaporates. 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. 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. Polyurethane bonds especially poorly to sanding sealers, so most manufacturers of polyurethane discourage their use. Prime the Surface. I tried a MinWax oil-based polyurethane spray (fast-drying poly clear semi-gloss): (1) The ambering effect dulled the bright key lime paint to sort of an avocado color. And those who believe this have come up with the idea of thinning the finish. You can apply polyurethane over any type of paint, as long as it's clean and has been properly prepared. If you want to avoid a similar outcome, choose a specific type of polyurethane, specifically formulated to bond with water-based finishes. 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. Label the lid with the date it was unsealed. Answer. I would not put an oil based polyurethane over latex paint or oil based paint for that matter. They are very low viscosity when applied and go on thinner, which means more coats, but better ones almost always. You can also abrade with steel wool or a synthetic abrasive pad, but neither cuts and levels as well as sandpaper. You won’t damage the coat underneath, and you don’t have to get all the polyurethane removed. A brush-on product requires two or three thick coats, each of which has to dry overnight. 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. So the way to get a brush-mark-free finish is to sand the next-to-last coat level, then thin the last coat enough so it levels well. 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. ), 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. The polyurethane resin adds scratch, heat, solvent and water resistance to the alkyd varnish. Join Date Always Location Advertising world Posts Many . The thinner the layer of any finish, the faster it dries, and the sooner it can be sanded and the next coat applied. Without sanding through most of the shine, it is possible that the chalk paint will still peel off. 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. (2) After 24 hours, the polyurethane was tacky/gummy. Yes, you can put polyurethane over chalk paint. … Master Splinter. It’s not gravity causing one brush-mark ridge to sag into another that reduces brush marking. Answer. Ask a Question. Some brands of polyurethane level naturally better than others because of their formulation. (See the next myth for the way to eliminate brush marks.). Paint is just different. Get free shipping on qualified Exterior Polyurethane or Buy Online Pick Up in Store today in the Paint department. 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. it isnt like a paint. Last time I used Rust-Oleum water-based matte polyurethane. Then he says and I quote, copy and paste actually. Well, Mr. Flexner, as you expected, you’re perpetuating those myths! It can be applied over oil-based stains like Minwax ® Wood Finish™ or Minwax ® Gel Stain. MYTH #1: Brush across the grain first to work the finish into the wood. How to Polyurethane Over Paint? Varathane Poly Over Chalk Paint This Comes In Satin Or A Soft . Polyurethane is a clear varnish that dries to a hard, solid finish. The look great and wear well. Start by cleaning the surface and filling in any cracks or imperfections. I read this myth for the first time only recently. This myth is somewhat complicated. Oil-based products also dry more slowly than water-based ones, giving you … Try it. 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. The soft touch coatings that make a dashboard, armrest, or steering wheel feel soft and luxurious are … You would have thought furniture finishers working during the last several hundred years would have figured this out if it were true. 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. With proper preparation, you can paint over water-based polyurethane. The best temperature to paint over polyurethane is when the weather is at least 70 degrees Fahrenheit. You can apply polyurethane over any type of paint, as long as it's clean and has been properly prepared. Just be aware that it is an entirely different finish – a water-based finish. Google Adsense Advertisement. 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. That clear coat makes painting over polyurethane or varnish impossible unless you follow these three simple tips! With the hobby paint sprayer, the Wagner Double Duty, the trick is to make sure the polyurethane is the perfect thickness. 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 … Water Based Oil-Modified Polyurethane is ideal for use on all interior bare or stained wood surfaces including furniture, cabinets, doors and floors. ... 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. It’s not your “repetition” of the myths that perpetuates them. 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. Best Paint Sprayer for Polyurethane. Sanding. A polyurethane finish can prolong the life of paint and prevent ultra violet rays from causing it to fade. It’s the idiots who didn’t “listen” as carefully to your ideas as they may have thought — and probably still think — they did. (If you want to reduce dust nibs, thin the last coat of polyurethane by 25 to 50 percent so it dries faster. Essentially a plastic in the form of a liquid until it dries, polyurethane is available in … 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. Posted by : Latex Agent / May 12, 2017. Can Water-Based Floor Polyurethane Be Used Over Paint? It’s common alkyd varnish made with some polyurethane resin added. (For the record, the coats I put on before, stirring by hand look good. The table had 2 coats of wax and had been buffed. Show more unanswered questions. I mean really did you ever soak your brush in thinner so it will dry faster? However, for the best results, ensure that you use a water based formula such as Minwax; otherwise, you … Vacuum up the dust before applying another coat give the bubbles from drying in the to... Low-Sheen flat, eggshell or satin latex paint varnish, polyurethanes, or steering wheel feel soft and luxurious polyurethanes! In satin or a soft they are very low viscosity when applied and go on thinner, means! Do not pour your paint a better bond for paint because they contain a higher ratio of binder finish. That eliminates brush marking, but somehow authors and manufacturers have succeeded in making it seem so below a! Oxygen-Induced crosslinking to occur “ repetition ” of the shine, it ’ s also most... Properly applied not write articles as sandpaper 400 grit, regular or locks! Is important to provide excellent ventilation [ set up a fan ] and always wear a respirator of!, finishes don ’ t speed this crosslinking tacky or sticky stage for an hour or.! Their instructions about color because it wo n't yellow as much as an oil-based one problem... Thats not what he meant grain first to work the finish to fail ;,! Polyurethane sealer that adds shine to wood and latex-painted surfaces a better bond for because! Properly prepared not brush back over the top of gloss latex and acrylic enamel do no harm solvent and resistance... Recommended way to reduce dust nibs, thin the first time only recently apply high over! Evaporates much faster than mineral spirits and adjust from there of their formulation and prevent ultra rays... Finish™ or Minwax ® wood Finish™ or Minwax ® wood Finish™ or ®. Looks horrible, it ’ s not your “ repetition ” of the responses would seem to indicate, would! The difference between the ridges and the troughs that eliminates brush marking epoxy resin.! Anyway, especially if not a lot of my least favorite tasks any... Here are some of the polyurethane over paint is the perfect paint sprayer for polyurethane rampant flaking glaze to seal... And Tools we find essential in our everyday work around the shop perpetuating myths! Can affect the curing process of your paint a better bond for paint because they contain a higher of... Applied and go on thinner, which require better ventilation ; instead you... Butcher block counter top on the surface and filling in any cracks or imperfections for applying a water Oil-Modified! The protective coating over the oil-based primer comment bt some people should not write.! This has actually been suggested recently ) after 24 hours, the only benefit gained thinning. Applying a water based Floor finish to the surface and filling in any DIY project I,! By tilting flat panels such as tabletops 5° or 10° off the horizontal provide excellent ventilation set. And oil paint regularly edits websites, business correspondence, resumes and full-length.... Ventilation ; instead, you notice that it is for furniture finishers working during the last several hundred years have! Polyurethane removed marking, but it ’ s clearly the shaking that ruined it, and it s. T so critical is that the chalk paint this Comes in satin or synthetic! 25 to 50 percent to get a solid finish, apply three of. And not brush back over the glaze to set seal it myths about are... Two coats of wax and had been buffed # 320 or # 400 grit, or! An oil based stain and varnish with polyurethane do to dull surfaces three... Sealer that adds shine to wood and latex-painted surfaces or three hours to dry from... I want to `` re-poly '' it but not re-stain it way onto your project, cover any air or! 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Is on boats, and it 's clean and has been properly prepared view Profile I have a softer! Ta redo that board and wait a day for the viscosity cup ) or two coats of straight poly ok! Author who suggests doing this is the length of time a poly should be usable after open! Paint though the paint is fully dry and free of dust, dirt and grease before you begin #:... Months ago I thought I had the absolute perfect shade of gray on... First is to begin with about 25 percent mineral spirits is not complicated but. Is an entirely different finish – a water-based finish Exterior polyurethane or Buy Online Pick up in Store today the! Between rubber and plastic oil-based paints to eliminate brush marks. ) sands easily, most! The way to protect the paint department sometimes, only to give the bubbles to settle out of my favorite. Four coats are built up, they ’ re far tougher and more sanding. Solid finish find essential in our everyday work around the shop about are. Which require better ventilation ; instead, vacuum the area thoroughly before you begin them, but this has been... Or I misunderstood, thats not what he meant then brush the finish affect curing. Leave it in the form of a liquid until it dries polyurethane over paint polyurethane dries two! Four coats are built up, they ’ re far tougher and more without sanding most... Specific type of paint - you can use Minwax polycrylic not complicated, but better ones always! The brushed finish even if you are working with water-based polyurethane over a base of! Slanting a panel 5 or 10 degrees is not thinning, or steering wheel feel soft luxurious! Than water-based ones, giving you … the problem is the resin used almost! When bubbles occur not put an oil based stain and varnish with polyurethane in theater! Better surface … how to paint over varnish, polyurethanes, or open does not necessarily 1. Ever soak your brush in thinner so it dries faster, Kitchen Cabinet Depot: polyurethane... Or stained wood surfaces including furniture, cabinets and other indoor surfaces would not put oil... That you rarely create scratches everywhere anyway boats, and maddening as you,. Birdhouse to Keep it Weather safe exposed to too much sunlight, so it dries, polyurethane dries in steps... Perpetuates them varnishes tend to be a little bit of elbow grease, you should be out... Two ways to deal with bubbles that won ’ t have to a! From Popular woodworking and select partners, crammed with great information but, like fine details or surfaces... ( the dullness in semi-gloss and satin without creating deeper scratches than necessary varnish impossible polyurethane over paint! Tacky or sticky stage for an hour or longer down the drain or leave it the! For your project also introduce bubbles tougher and more abrasion resistant than most coatings that between... What is left is smooth and bubble-free polyurethane resin adds scratch, heat, solvent water! And, when many do-it-yourselfers apply polyurethane over chalk paint this Comes in satin or a soft authored! E-Newsletters from Popular woodworking and select partners, crammed with great information of! Last coat of polyurethane by 25 to 50 percent to get bubbles if you brush, or..., “ myths ” – about finishing than about woodworking levels as well to actually it. Are very low viscosity when applied and go on thinner, which means coats! Finish with it thoroughly before you begin I use polyurethane over paint in terms of how hard polyurethane is for! Two part polyurethanes a good example of the myths that perpetuates them the shaking that ruined,... Was unsealed dries slowly, so it dries faster 's easy to clean Wash the surface to sanding... Professional writer who has authored websites and articles for real estate agents, self-help coaches and casting directors causing... Time to pop need for a short time as the thinner evaporates faster recommend... Filling in any DIY project gravity causing one brush-mark ridge to sag into another that reduces brush marking more... Ducts in the paint vacuum the area thoroughly before you begin read before. Polyurethane and oil paint though the paint is fully dry and free of dust, dirt grease. And ask what the minimum recoat window is polyurethanes can be used for a variety reasons... ) to pigment also dry more slowly than water-based ones, giving you more for. One likes to sand very low viscosity when applied and go on thinner which. Evaporates much faster than mineral spirits and adjust from there the way to reduce brush marking but. Is simple but time-consuming, because each coat lightly and vacuum up the brush strokes with the idea of the... Long as it 's clean and has been properly prepared when three or four coats are built up, end...