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3M makes several products that you can buy at WalMart. They're called "Marine Fiberglass Restorer and Wax" and "Marine Super Duty Rubbing Compound". Both are a liquid product and work well on heavily oxidized surfaces. Don't rub too hard and long with the rubbing compound or you'll eventually rub right through the gel coat
I just shined up my Fiber Core motorcycle trailer I bought using Dir-Wash metal polish. Then go over it with Dri-Wash N Guard. Best polish I ever used for faded fiberglass.
Frank