With proper preparation, you can paint over water-based polyurethane. Varathane is a water-based polyurethane sealer that adds shine to wood and latex-painted surfaces. Here are some supplies and tools we find essential in our everyday work around the shop. All the Paint to Cure. In hindsight, the label warns of this. Oil-based polyurethane is simply a type of varnish. What Should I Apply to a Painted Birdhouse to Keep It Weather Safe? That’s what I get. You can apply poly over the glaze to set seal it. ), Bob Flexner is the author of "Flexner on Finishing," "Wood Finishing 101," and "Understanding Wood Finishing. Applying one or two coats of polyurethane to a painted surface is a good way to protect the paint. Even if it did have bubbles in the can….it can be worked out with gentle strokes when applying. Can you put polyurethane over chalk paint though the paint is a bit thicker than latex then it does not necessarily cover 1 jacket. 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. To add durability without affected color, use a water-based finish. It can be applied over oil-based stains like Minwax ® Wood Finish™ or Minwax ® Gel Stain. Minwax Polycrylic is junk, in my humble opinion. Painters don’t mind because dust isn’t a big problem for them, but it is for furniture finishers. Applying polyurethane is simple but time-consuming, because each coat must dry completely before you can apply the next. You can do this for 15 to 30 minutes after application without a problem. He didn’t necessarily recommend shaking the can. How to Paint Over Varnish, Polyurethane, Seals and More Without Sanding. I use two part polyurethanes a good bit and like them a lot more than the one part types. As some of the responses would seem to indicate, one would do well to actually read it before responding. Improper techniques can lead to your paint finish to fail; bubble, peel or chip . You would be better off using a water based polyurethane. 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. This creates more time for dust to settle and stick to the surface. I don’t know that there is exactly the perfect 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. Mitchell also regularly edits websites, business correspondence, resumes and full-length manuscripts. Use a water-based product if you're concerned about color because it won't yellow as much as an oil-based one. When painting over polyurethane is important to provide excellent ventilation [set up a fan] and ALWAYS wear a respirator. The best temperature to paint over polyurethane is when the weather is at least 70 degrees Fahrenheit. Or I misunderstood, thats not what he meant? The trick is to know how to keep the bubbles from drying in the finish. Enter your e-mail address in the box below for a free digital guide to finishing. But with the right materials, and a little bit of elbow grease, you can paint over the polyurethane. I just did, trusting your article. They have done this by introducing myths into their instructions. Cleaning the Surface. The Tools Used for Applying a Water Based Floor Finish. When you apply polyurethane, you notice that it stays wet on the surface for a short time as the thinner evaporates. It can ruin your entire painting job and create cracks on the surface. Google Adsense Advertisement. 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. Polyurethane wood finishes are modern variations of oil-based varnishes with alkyd binders that cure to a hard, protective finish. And consumers are more vulnerable to misinformation – that is, “myths” – about finishing than about woodworking. 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. Most of the bubbles will disappear. Once a myth gets into print, it’s common for it to be repeated endlessly until it becomes “fact,” simply because everyone says it. It’s one of my least favorite tasks in any DIY project. Polyurethane wood finishes are modern variations of oil-based varnishes with alkyd binders that cure to a hard, protective finish. 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. 200 characters left. Sure, if you shake the can, bubbles appear in the finish. 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. MYTH #4: Thinning with naphtha makes polyurethane dry faster. A wipe-on product requires four or five coats, each of which takes only two or three hours to dry. Answer. Can Water-Based Floor Polyurethane Be Used Over Paint? And, when three or four coats are built up, they’re far tougher and more abrasion resistant than most coatings. And not brushing back over to stretch out the finish and thin it on the wood – and also line up brush strokes – leads inevitably to runs on vertical surfaces and build-up on horizontal surfaces wherever you set down a finish-loaded brush. You can also abrade with steel wool or a synthetic abrasive pad, but neither cuts and levels as well as sandpaper. I rarely comment bt some people should not write articles. Be aware that dust from your work area can mar the finish if it finds its way onto your project. This is a very old myth that is more “misleading” than “myth” because it’s true but it doesn’t matter. You won’t damage the coat underneath, and you don’t have to get all the polyurethane removed. 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. 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. Varathane Poly Over Chalk Paint This Comes In Satin Or A Soft . The purpose of this instruction is to create scratches in the surface so the next coat of finish can establish a “mechanical” bond. I do however thin it sometimes, ONLY to give the bubbles a chance to pop . The proper way to polyurethane over paint Step 1: Wash the surface. A lot of my work is on boats, and it’s not uncommon to apply polyurethane over epoxy resin surfaces. 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. It’s the idiots who didn’t “listen” as carefully to your ideas as they may have thought — and probably still think — they did. 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