Here's some other pad options that work GREAT of gel-coat...
The coarse blue RUPES pads.
RUPES foam buffing pads
The blue work great with the Captains Compound and rotate very well on the Griot's 6" DA polisher.
The 7" pad fits the Griot's 6" backing plate and the 6" pad fits the Griot's 5" backing plate.