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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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.
You don't. You will most likely have to restain after stripping.
Yes, that was the original intention of urethane.
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.