You can use a regular paintbrush to do this. Stir the mixture thoroughly with a wooden stick. Similar Asks. to thin I use denatured alcohol - but do note - the waxes will fall out of suspension with time, so don't thin a big batch for later-later-long term use. It depends on what kind of polyurethane coat was used on the wood, but there are more general solvents you can try first. Mix with a wooden stir stick, scraping into the mixture any lacquer from the base and sides of the can. Several substances can be used to thin polyurethane including turpentine, mineral spirits, paint thinner or, in some cases, water. Polyurethane is a clear top coating applied over wood finish and paint. Yes, it will make the product weaker, though I don't know how much weaker. Apply the mixture onto the polyurethane finish, covering the stained wood. - Pour equal parts of lacquer thinner and denatured alcohol into a small empty paint can. … Brush stripper onto an area adjacent to the area previously stripped.More items…. 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 3: Use The Mixture To Remove Polyurethane. At the same time, move any lacquer that might settle on the container’s base or sides. Therefore, it won’t strip away the stain. Polyurethane can be removed using solvents that can be found at your local hardware. Not often used because it’s been replaced with polyurethane and other resins, shellac works best if thinned with denatured alcohol. Thinner or denatured alcohol can remove polyurethane for the most part. No Result Now, you will need to apply the mixture to the polyurethane finish. Scrubbing is futile without the right ingredients, so don't rub your hands raw. In this procedure, denatured alcohol acts as a cleaning agent. … Apply stripper using a brush. 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. What can I use to remove polyurethane? Step 3: Use the mixture of denatured alcohol and lacquer thinner to remove polyurethane . The denatured alcohol will dry quickly and clean the wood. The alcohol should dissolve any stripping solvents on the first pass. Step Two: Mix the Lacquer and denatured Alcohol. Wipe the brush off again on a rag, working as much stain out of the brush as you can. Pour equal parts of lacquer thinner and denatured alcohol into a small empty paint can. I wipe on oil base poly all the time - Minwax does not need thinning, others are noticeable thicker. Mix equal parts denatured alcohol with lacquer thinner in an empty paint can. Either 91% isopropyl, or denatured alcohol (Lowes, Home Depot, paint stores) should work. Ensure you rub with the grain so as not to introduce any scratches that may become visible when the finish has been applied. This task is accomplished through the use of chemical paint and varnish removers and light sanding.Assemble equipment. ... - Apply the mixture onto the polyurethane finish, covering the stained wood. After the wood is dry, stain, paint or install the untreated wood. 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 … ... Pour equal parts of lacquer thinner and denatured alcohol into a small empty paint can. … Scrape the area with a plastic scraper or plastic putty knife. 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