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. Sand each coat lightly and vacuum up the dust before applying the next coat. Myths are much more prevalent in finishing than in woodworking because finishes are chemistry, and you can’t always “see” differences in chemistry. Can you put polyurethane over chalk paint though the paint is a bit thicker than latex then it does not necessarily cover 1 jacket. In fact, the only benefit gained by thinning is faster drying. Apply oil-based paint primer. 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 … But with the right materials, and a little bit of elbow grease, you can paint over the polyurethane. 1. ), Bob Flexner is the author of "Flexner on Finishing," "Wood Finishing 101," and "Understanding Wood Finishing. It was stained with a stain containing polyurethane. But, like all varnishes, polyurethane dries in two steps. Brush-on varnishes tend to be a little sturdier, while wipe-on varnishes tend to have a slightly softer finished look. It’s clearly the shaking that ruined it, and not my application. 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. 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. Instead, you should be using a different type of paint - you can use Minwax Polycrylic. You might opt for Polyurethane over rubber or plastic due to its durability, the fact that you can adjust its … MYTH #7: Scuff sand between coats to get a good bond. The look great and wear well. The purpose of this instruction is to create scratches in the surface so the next coat of finish can establish a “mechanical” bond. Wash exterior painted finishes, using a pressure washer. © Copyright 2020 Hearst Communications, Inc. Assuming you want the paint color under the finish to remain visible and unaltered, choose a water-based polyurethane for your project. 20th Mar 2015, 07:21 PM #2. You would be better off using a water based polyurethane. 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. That clear coat makes painting over polyurethane or varnish impossible unless you follow these three simple tips! MYTH #2: Thin the first coat 50 percent to get a good bond. Polyurethane Over Paint In terms of how hard Polyurethane is, it falls somewhere between rubber and plastic. Most woodworkers want their polyurethane to reach a dust-free stage faster, not slower, as evidenced by myth #4. 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. Do not pour your paint and solvent down the drain or leave it in the trash bin. The first is evaporation of the thinner. You can apply poly over the glaze to set seal it. 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. But with the right materials, and a little bit of elbow grease, you can paint over the polyurethane. Some products are designed to brush on, while others are designed to wipe on. 200 characters left. (2) After 24 hours, the polyurethane was tacky/gummy. (about 30-35 seconds for the viscosity cup). 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. View Profile Just be aware that it is an entirely different finish – a water-based finish. MYTH #4: Thinning with naphtha makes polyurethane dry faster. Unfortunately, when many do-it-yourselfers apply polyurethane over a water-based latex or acrylic paint, they end up with rampant flaking. There have to be big flaws in the surface to require sanding with coarser grits. So most manufacturers of polyurethane and oil paint create a better bond for paint because they a... Resin adds scratch, heat, solvent and water resistance to the alkyd made... Over a water-based polyurethane, Seals and more without sanding through most of the,! Ve ever applied your work area can mar the finish to Kitchen cabinets, Kitchen Cabinet:... 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