Use a clean foam brush to apply the polyurethane coating. Adding a faster-evaporating thinner doesn’t speed this crosslinking. So now you’re ready to apply the finish, and if you’re like I was, you’ll get the urge to brush it on just like you would have a coat of paint. Wet sanding is used for smoothing clear wood finishes when fine quality is desired. After your polyurethane finish has dried and is cured enough to work on, we can wet sand the finish. Wipe Instead of Brush. Q: What will happen to a wood floor if you do not sand between coats of polyurethane? Come join the discussion about shop safety, wood, carpentry, lumber, finishing, tools, machinery, woodworking related topics, styles, scales, reviews, accessories, classifieds, and more! This is the length of time it takes for the oxygen-induced crosslinking to occur. It’s important to varnish the wood and dry-sand it carefully first. is by far the best product for sanding a finish. I generally start at 80 grit and end with 100 or 120 grit. This type of polyurethane dries up easily so one can walk on the floors within 10 hours of application. Thoroughly remove sand… Then apply the next coat. I'm a rookie. I have only used water with a 400. Using 320 grit wet-or-dry paper (cut with scissors into 1 1/2" squares and backed by a squared rubber eraser), the stock is wet sanded with the same 1 to 2 solution of finish. Sand the surface to 320-grit. With a wipe on poly 3 coats usually equal 1 coat of brush on poly so since you sanded between coats you probably are at about 1 coat. Instead, you are going to want to do one of two things; Instead, you are going to want to do one of two things; Wet Sand The Wood: This method of sanding involves using water, or some other lubricant, to help remove the scratches as you sand (ideally without marking the surface any further). In general, the best liquid to use for most materials is water with a little bit of detergent in it. If they are still showing wet sand … However, the quality and protection of most film building finishes (such as polyurethane, lacquer, and shellac) goes up exponentially on the first few coats (e.g., there’s a huge improvement in durability and moisture excluding effectiveness from coat #1 to coat #2, and another big jump from coat #2 up to coat #3.) However, you should know that water-based polyurethanes and oil-based stains do not match well. This is a single-stage paint, meaning that there is no clear coat, the paint applied is the color and finish coat all in one. The dream of a glass-smooth tabletop is always spoiled by brush marks and bits of dust and other debris. And use a sanding block too, this will help keep the surface flat. If the finish “balls up” or seems wet, let it dry some more. Lightly mist the surface with water so you can sand down the finish more efficiently. Dry sanding is especially recommended when you use epoxy resin in combination with wood or other moisture-sensitive materials. Fill the grain with an oil-or water-based wood grain filler. A: Nothing, provided you apply each coat of finish within a reasonable amount of time. I don't think it was a good idea to use olive oil in the sanding process. Prepare the polyurethane by reducing it about 10 percent with mineral spirits, unless you're using water-based polyurethane, which doesn't need thinning. You might sand through some of the color, especially at edges. Without the liquid, material can build up in the sandpaper and leave behind scratches that are larger than the particle size, ruining your finish. Tip 4: Use a roller on large, flat surfaces. 6 Go with Polyurethane. Sand down the brush marks lightly with the fine-grit sandpaper. Image Credit: Stockbyte/Stockbyte/Getty Images Cloudy finishes appear for several reasons, including using an old product or one that's been stored in a very cold or hot environment. Smoothly remove materials or sags if any created due to the clearcoat layers. With lacquers, water-based finishes, and shellac, you’ll need to act right away. Note: The compound has a fine abrasive that’ll remove any scratches left by the 400-grit sandpaper and restore the luster in the polyurethane finish. No way will you get a shine polishing after just 1000 grit. How do I smooth polyurethane after it dries but still maintain its finish? Start the process exactly like above with 400 or 600 grit paper. VerticalScope Inc., 111 Peter, Suite 901, Toronto, Ontario, M5V 2H1, Canada. Polyurethane finish. Sand lightly with 240-grit sandpaper between coats, then let the … Starting first with this Ranger that I repaired the cab corner on. 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