If the poster is serious about restoration it is going to take work & plenty of it. There is no magic product that makes an afternoons work out of it.
Had my share of taking care of boats for forty plus years.
3M is a very big name in fiberglass maintenance products. Three grades of compound are available from a coarse to a fine. Alot depends on the thickness of the gelcoat. Gelcoat is heavy and expensive stuff. RV builders are not known for using more than absolutely necessary. Being too aggressive will go through gelcoat very quickly if not careful.
