Let the first coat dry for the time recommended on the container, then scuff it lightly with 120-grit sandpaper. Generally, a week is more than enough for any paint to cure. Oil-based products also dry more slowly than water-based ones, giving you more time to work. 10 Best Wood Chipper for Small Farm- Reviews & Buyer’s Guide, 10 Best Clear Finish for Exterior Wood Doors- Reviews & Buyer’s Guide, 10 Best Cordless Compound Miter Saw- Reviews & Buyer’s Guide. The goal is to slightly flatten the sheen without producing deep scratches that might be visible under the polyurethane. Let the paint dry, then scuff with 120-grit sandpaper to etch the surface. Generally, a week is more than enough for any paint to cure. Applying polyurethane over paint has several advantages. He worked as an expert consultant with eHow Now and Pro Referral -- a Home Depot site. Assuming you want the paint color under the finish to remain visible and unaltered, choose a water-based polyurethane for your project. If the paint isn't fresh, wash off grease or stains with a strong detergent solution. Some of them are listed below: Applying polyurethane over paint is an easy task that anyone can do. It was fine, but I wasn’t impressed enough with it to use it again. You don’t need to use more than two layers. Use a water-based product if you're concerned about color because it won't yellow as much as an oil-based one. It protects your wooden surfaces from scratches and prevents paint from peeling, and it's easy to clean. Polyurethane is a clear varnish that dries to a hard, solid finish. This deglosses the finish as well as cleans it, providing for better polyurethane adhesion. Doing so will remove dust particles that might have adhered to the surface while drying. It is water-resistant, so it keeps the paint from swelling and deteriorating. Sand each coat lightly and vacuum up the dust before applying the next coat. Once you have a clean and dry surface, it’s time to etch it. These qualities make it ideal for finishing tabletops, bartops, cabinets and other indoor surfaces. Sometimes, your wooden structures need more protection than just standard paint. Be aware that dust from your work area can mar the finish if it finds its way onto your project. There are several protective coats that you can add to the paint on your furniture, but can you polyurethane over paint. A wipe-on product requires four or five coats, each of which takes only two or three hours to dry. You can apply polyurethane over any type of paint, as long as it's clean and has been properly prepared. If the wood grain is visible, brush in the direction of the grain. 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. Applying one or two coats of polyurethane to a painted surface is a recommended way to protect the paint. How to Apply Polyurethane to an Old Oak Tabletop, How to Finish a Painted Concrete Floor With Polyurethane, Kitchen Cabinet Depot: Applying Polyurethane Finish to Kitchen Cabinets. Hunker may earn compensation through affiliate links in this story. You can either use a palm sander to scuff the surface or do it by hand. Minwax Polycrylic is junk, in my humble opinion. If you are working with water-based polyurethane, cover any air vents or ducts in the room to minimize dust in the air. Polyurethane also makes the surface look good by adding a finish to it. Applying one or two coats of polyurethane to a painted surface is a good way to protect the paint. Do not thin the polyurethane before spraying it -- it's thin enough to spray out of the can, and adding more thinner may cause it to run. Once you’ve etched the surface, clean the surface with a cloth to remove any sanding dust that might be left. Water-based polyurethane, on the other hand, has no smell to it, dries faster and keeps the color of the surface intact. Now, apply your second coat just the way you did with the first one. Furthermore, it helps flatten any bubbles that might have formed during the application.eval(ez_write_tag([[300,250],'woodcritique_com-box-4','ezslot_2',109,'0','0'])); Now, apply your second coat just the way you did with the first one. Antique Restorers: Why Do I Get Bubbles in Polyurethane? 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. Use 120 grit sandpaper to scuff the paint. Step 2: Scuff away. 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. Polyurethane can crack and bubble if it is exposed to too much sunlight, so it isn't suitable for outdoor surfaces. If you're applying polyurethane to a painted floor, you can also use a floor finish applicator, which is a pad or weighted tube that you drag over the floor. Avoid using a roller -- it leaves bubbles that may harden into the finish. If you see a bubble, flatten it immediately with the tip of a paintbrush. Let the final coat dry for the recommended time, then give it an extra 24 hours to harden before walking on or handling the object you painted. Chris Deziel is a contractor, builder and general fix-it pro who has been active in the construction trades for 40 years.

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