I put glovit on the bottom of my boat. It's 15ft Garvey. I used it because of how well it works on drift boats for sliding over rocks. I have hit some rocks here and there and actually gave it a good inspection a couple of weeks ago and it it is holding up well. The other option I was looking at was Coatit I heard that it is more brittle that Gluvit so it can take the flexing of the hull better.