Has anyone ever used this stuff on their boats? Its on the bottom of a boat that I bought and the guy I bought it from said it was used on the bottom of aluminum boats for strength and it makes it slicker so that it slides over trees and rocks better. Anyway I need to take some of it off to do some welding but would like to get some more of it to put back on when im done. Where can I find it and how much does it cost? :help: