Tough spots on Gel coat - Looking for suggestions

So helping clean up my dad yamaha. There are 2 areas that the bumpers have messed up the gel coat.

I hit them with a wool pad and Ardex VG Marine Variable - Vanishing Grit Compound which did pretty good on the rest of the gel coat but not on these 2 spots.

Any suggestion as to what would help? Will post some pictures in a bit.