I've had 3 different men
tell me over the years that when you use rubbing (cutting to the AUssies) compound on gelcoat
, you open up its structure which is actually extremely small bubbles... Which eventually collect dirt between rubbings and waxings. We had such porous gelcoat on our previous boat. The product we used to deal with it is a polymer, called PolyGlo (in Australia) and TSRW* in the US. It comes as a package containing an applicator, and two bottles of liquid, one a cleaner; the other, the polymer.
First you clean, then spread the polymer evenly over the hull
. It is amazing how well it works, takes about 6 coats on a really porous hull
, and the smooth shine lasts from haul-out to haul-out.
*supposedly means This Stuff Really Works