However, the finish is not as smooth as the oil-based polyurethane. 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. Here are some of the steps you should observe: If you are looking to apply polyurethane over a freshly painted surface, you must wait for it to cure first. Wash exterior painted finishes, using a pressure washer. Once the first coat has dried, use the same 120 grit sandpaper that you used earlier to etch the surface again. eval(ez_write_tag([[300,250],'woodcritique_com-medrectangle-4','ezslot_0',108,'0','0'])); If you’re applying polyurethane over an already painted surface, you need to wash the surface for any stains and grease. Apply oil- or water-based polyurethane with a brush, or spray it. This isn't safe with oil-based products, which require better ventilation; instead, vacuum the area thoroughly before you begin. Make sure the paint is fully dry and free of dust, dirt and grease before you begin. Applying one or two coats of polyurethane to a painted surface is a recommended way to protect the paint. Using a roller to apply polyurethane is not advised as it can form bubbles that may harden later and ruin the finish. Oil-based polyurethane levels out to a smoother finish, although it takes several hours longer to dry. © Copyright 2020 Hearst Communications, Inc. So, it saves you the cost of repainting. Hunker may earn compensation through affiliate links in this story. Oil-based products also dry more slowly than water-based ones, giving you more time to work. If the paint isn't fresh, wash off grease or stains with a strong detergent solution. She graduated from Syracuse University in 2007 with a Bachelor of Fine Arts in musical theater. Oil-based polyurethane has a strong smell and amber hue. Doing so will remove dust particles that might have adhered to the surface while drying. Step 2: Scuff away. Choose the Proper Type of Paint Roller. If you are working with water-based polyurethane, cover any air vents or ducts in the room to minimize dust in the air. Polyurethane is a clear varnish that dries to a hard, solid finish. Polyurethane can crack and bubble if it is exposed to too much sunlight, so it isn't suitable for outdoor surfaces. Just like every polymer, polyurethane is a synthetic compound made from organic units. There are several protective coats that you can add to the paint on your furniture, but can you polyurethane over paint. Sometimes, your wooden structures need more protection than just standard paint. Generally, a week is more than enough for any paint to cure. It takes longer to dry as compared to water-based polyurethane but provides a smoother finish. This deglosses the finish as well as cleans it, providing for better polyurethane adhesion. The goal is to slightly flatten the sheen without producing deep scratches that might be visible under the polyurethane. 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. I needed to just put a clear water-based polyurethane over the paint. Once the second coat has dried, give it another da. Mitchell also regularly edits websites, business correspondence, resumes and full-length manuscripts. Water-based polyurethane, on the other hand, has no smell to it, dries faster and keeps the color of the surface intact. You don’t need to use more than two layers. You can either use a palm sander to scuff the surface or do it by hand. Once you have a clean and dry surface, it’s time to etch it. Curing times vary according to paint type and atmospheric conditions, but a safe average is about a week. Because the mixture is thinner, you may want to apply an extra coat. Minwax Polycrylic is junk, in my humble opinion. Antique Restorers: Why Do I Get Bubbles in Polyurethane? It was fine, but I wasn’t impressed enough with it to use it again. After you’ve finished with the first coat, allow it to dry. Mix 1/2 cup of trisodium phosphate with a gallon of warm water and scrub with a sponge or rag. Intense water pressure may strip the paint. Doing so will remove dust particles that might have adhered to the surface while drying. Oil-based polyurethane levels out to a smoother finish, although it takes several hours longer to dry. Once the second coat has dried, give it another day to harden before you start using the surface. These qualities make it ideal for finishing tabletops, bartops, cabinets and other indoor surfaces. Avoid using a roller -- it leaves bubbles that may harden into the finish. Assuming you want the paint color under the finish to remain visible and unaltered, choose a water-based polyurethane for your project. You have to be gentle with the sandpaper as any deep scratches would be easily visible below the polyurethane coating. A brush-on product requires two or three thick coats, each of which has to dry overnight. 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. 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. So, it saves you the cost of repainting. Let the paint dry, then scuff with 120-grit sandpaper to etch the surface. You shouldn't need any more than two coats. It’s usable in hot, cold as well as humid environments as it is not affected by temperature or moisture. You don’t need to use more than two layers. You can do it by hand, or use a palm sander. Polyurethane protects the paint from mold, mildew or fungus. If bubbles or brush marks are a recurrent problem when applying polyurethane with a brush or floor applicator, add 20 percent to 25 percent solvent to the polyurethane to help it flow out. Scuffing removes small dust particles as well as flattening any bubbles that hardened into the finish. Once you’ve etched the surface, clean the surface with a cloth to remove any sanding dust that might be left. 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. An avid craftsman and musician, Deziel began writing on home improvement topics in 2010. 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. Use 120 grit sandpaper to scuff the paint. Some of them are listed below: Applying polyurethane over paint is an easy task that anyone can do. Leave the second coat to dry for the time recommended on the container. The proper way to polyurethane over paint Step 1: Wash the surface. y to harden before you start using the surface. Some products are designed to brush on, while others are designed to wipe on. Sand each coat lightly and vacuum up the dust before applying the next coat.

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