It depends on what kind of polyurethane coat was used on the wood, but there are more general solvents you can try first. Take a wad of 0000 steel wool, liberally wetted with denatured alcohol, and wash down the piece one area at a time. You can make your brush easier to clean by dipping it in mineral spirits or water, depending on whether you are using an oil- or water-based polyurethane … The denatured alcohol will dry quickly and clean the wood. Pour equal parts of lacquer thinner and denatured alcohol into a small empty paint can. Mix with a wooden stir stick, scraping into the mixture any lacquer from the base and sides of the can. The alcohol should dissolve any stripping solvents on the first pass. Epoxies can be thinned with alcohol, but don't use the common 70% isopropyl alcohol (rubbing alcohol). Therefore, it won’t strip away the stain. This task is accomplished through the use of chemical paint and varnish removers and light sanding.Assemble equipment. Scrubbing is futile without the right ingredients, so don't rub your hands raw. A slight thinning (5-10%) generally allows the finish to flow out better but the primary way to remove bubbles is to first apply the varnish by flowing it on--don't do a lot of brushing back and forth--and then "tip" it off using an almost dry brush and just use long strokes just barely letting the bristle tips touch the surface. You can use a regular paintbrush to do this. Thinner or denatured alcohol can remove polyurethane for the most part. … Apply stripper using a brush. The advantage of this mixture of denatured alcohol and lacquer thinner is while it will remove the finish from the surface of the wood, it’s not strong enough to damage the wood itself. Step Two: Mix the Lacquer and denatured Alcohol. Either 91% isopropyl, or denatured alcohol (Lowes, Home Depot, paint stores) should work. Step 3: Use the mixture of denatured alcohol and lacquer thinner to remove polyurethane . Not often used because it’s been replaced with polyurethane and other resins, shellac works best if thinned with denatured alcohol. What can I use to remove polyurethane? After the wood is dry, stain, paint or install the untreated wood. Ensure you rub with the grain so as not to introduce any scratches that may become visible when the finish has been applied. … Brush stripper onto an area adjacent to the area previously stripped.More items…. Several substances can be used to thin polyurethane including turpentine, mineral spirits, paint thinner or, in some cases, water. … Scrape the area with a plastic scraper or plastic putty knife. For a better result, stroke the place two or three times so that every part of the polyurethane gets covered. Use a paintbrush to apply the solution to the polyurethane finish. No Result Step 3: Use The Mixture To Remove Polyurethane. ... - Apply the mixture onto the polyurethane finish, covering the stained wood. Now, you will need to apply the mixture to the polyurethane finish. I wipe on oil base poly all the time - Minwax does not need thinning, others are noticeable thicker. ... Pour equal parts of lacquer thinner and denatured alcohol into a small empty paint can. Apply the mixture onto the polyurethane finish, covering the stained wood. Not enough to be a serious problem for your application. Polyurethane is a clear top coating applied over wood finish and paint. 23. Apply the solvent with a cloth rag. - Pour equal parts of lacquer thinner and denatured alcohol into a small empty paint can. Stir the mixture thoroughly with a wooden stick. Wipe the brush off again on a rag, working as much stain out of the brush as you can. Polyurethane can be removed using solvents that can be found at your local hardware. At the same time, move any lacquer that might settle on the container’s base or sides. In this procedure, denatured alcohol acts as a cleaning agent. Similar Asks. 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