"Borrowed" this from a fellow on another forum. This does work.
Quote:
"Depending what you are talking about, and how much you want to add to the weight of the hull, the guys at Free Spirit Marine gave me a great idea. First, get some Aluminum cleaner from a paint store. you have to get ALL the oxidization and oil off completely. You may wash with CLR and water, and follow with TSP and water, as well.
THEN, either take the hull to a truck bedliner company and have them spray the inside with the urathane coating, or go to Canadian Tire or NAPA and buy a few cans of their truck bedliner spray. either way, the stuff binds to the clean aluminum like you never beleive, and you can tap dance in the boat with impunity as you will have no noise on the rubber surface. Oh, the leaks will be sealed from the inside, and the urathane will flow around the rivets sealing them completely."