I use a 3m product call Perfect-it III, my hull is a 1985 Aquasport and with a mechanical buffer I start every season with the Gel-coat looking like it just came out of the show room. You can get it at any auto body supply store that stock 3m products, for about $30.00 a quart. For reference my boat is 27' with a 10' beam and I don't use the whole quart.
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