i have a 86 154 bumblee bee.as far as i can tell and fill there is no gel left on it,it is very ruff,it is brown with gold yellow flakes in it.me and dad are going to redo the carpet and some small floor work.do i need to sand this before i get the gel put on it?the bottom sides under cap is smooth but plan on doing this to,do i sand it to and what would you use?all of the top cap is very ruff,can get pictures if need to.thank you.