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Here is a caveat about restoring gelcoat. The mil thickness varies greatly on Boston Whaler boats. The Fisher Pierce boats of 1958-1971 vintage, also know as the blue hulls, have thicker mil gelcoat, and can, therefore sustain greater wetsanding frequency, than the later CML produced hulls of outrage Gray color and Desert Tan, e.g., a 1989 Boston Whaler Montauk 17. I used a different method for restoring the gelcoat on my 1970 Boston Whaler Nauset 16 than I did on my 1990 Montauk 17. I never dry sand the gelcoat unless I am doing a gelcoat repair. I loosen up heavy oxidation of gelcoat with a hand-wetsanding starting with 400 grit and a foam block (important). Finnegan's commentary is spot on for 3M product endorsements. When the gelcoat surface is ready for wax, there is really only one brand that stands up in a marine environment: Collinite #845.