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To achieve a Matt finish on polyurethane you must sand it with a grade p400 average particle size in microns(in inches) .00137. this will defuse the light rather than reflect the light. you can always use a matting solution such as turps but it can get very messy and sticky if you don't know what you are doing.
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How do you remove wet varnish from polyurethane?
Bleach
Why is polyurethane separating from table after sanding off marine spar varnish?
Often, poly will not adhere due to contaminants on the surface. Remove all of the loose coating, sand the surface, brush off the surface with a brush, then remove the remainder the dust with a tack cloth.
How do you remove polyurethane from a stain door without removing the stain?
You don't. You will most likely have to restain after stripping.
Should you use enamel or urethane to paint your car?
Yes, that was the original intention of urethane.
How can you remove stains or blemishes from a polyurethane watch?
You can remove stains or blemishes from a polyurethane watch by scrubbing it with a wet terrycloth that has been dipped in a solution of warm water and liquid dish soap. For tough stains, dip a melamine foam sponge into the solution, ring out and wipe the watch gently. Dry well with a clean towel.
