I have replaced some of the deck in my 1980 Glastron so now I need to put carpet back down. I have not decided if I'm going to use the old carpet, which is in great shape, or in I'll get new. I'm wondering if I need to sand down the surface of the existing plywood to get the old glue off or if I can just put new glue down and lay the carpet. I have waterproof carpet glue and am ready to go. Just not sure how to go about it. Thank you.