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I found a belt sander is a great tool in heavy removal of gel coat. I have a regular size and a little 2 in wide belt on a porter cable sander that is awesome. I know most will yell No belt sander but for heavy work it cant be beat. you will still have to run over it with a orbital but you will save a ton of time and paper if you use the little belt sander first. Start slow and use very light pressure until you see how it works for you.