Its been my experience with gel coat in the past on boats and motorhomes, once it has a chance to oxidize it will only continue to get worse over time, a good fiberglass cleaner wax will some times restore the shine for a short period of time, keeping the coach covered or inside is your best bet, heavy oxidation needs a rubbing compound with a power polisher, I just bought one at Home Depot for $34.00, then a mix of pads and a gallon of cleaner wax from Amazon, its a lot of work but if its not done on a regular basis the finish will just get worse, I did run across a product at a boat show once and it is some kind of coating and was expensive, it could only be applied by hand and no circular motion, had to be a back and forth to avoid air bubbles forming, the finish did last about 5 years using the boat in salt water, if I run across the product I will post the information, cost back then on a 21 foot boat was almost $200.00 for the product and a weeks work in buffing out the finish and then applying the product.
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