i have a 1986 fishrite and had the same problem. i had a hard time getting the old gluvit off too. i had the bottom done with line-x and love it. it has 4 seasons on it and is doing well. i dont know what the guy was talking about it sticking on rocks, mine is just the oppisite. i slide over rocks, that i have seen others hang up on. as far as the coating with graphite in it, i have heard of it causing electrolisis (spelling) on the aluminum, expessially in tidal salt water. my boat exterior was repainted with regular automotive paint. sometimes you need to etch the aluminum to get a better adhesion. hope this helps