Unless you are just doing little spots here and there, I recomend the full treatment every few years. I wish I could remember the name of the video tape on fiberglass repair (it's available at the big stores Wets marine Boat US etc...). The process of compounding the boat down begins w/ spending a few hundred bucks on serious polisher. A car polisher just won't cut it for the compounding process. Something w/ 2800 RPM or above and real heavy duty so you can put a lot of pressure on it to remove difficult areas. Select the Fiberglass rubbing compound grit best suited for your situation (coarse, fine etc...) Wash the hull with a strong but GREEN cleaner. Apply a spot of the compound and use the polisher to remove the least amount of material to deliver the original finish. BE CAREFULL ON THE CORNERS. Using clean cloth rags, wipe the hull down to make sure there are no places with built up compound. Apply wax It's real tough work, takes me 2.5 days on our 33 but it looks as good as it is going to when done.