What is the best product to remove the residue off of the fiberglass Gelcoat once the original stickers have been removed, what should be done after the old stickers are removed and the new stickers are installed to protect the Gelcoat and new stickers?

Acidtone

3M Adhesive Remover works well

+1

best product short of gasoline I think

Sticker Off

peanut butter

3m Adhesive Remover and a fingernail....

soyclean mastic and adhesive remover spray it on, let it sit, and then scrape it off with a plastic spreader or plastic razor blade

sticker shock.you can get it at autozone.

Not really a product, yet a tool. I have one that my friend used the entire wheel on removing graphics from his boat. Did an amazing job (graphics were nearing 12 years old)

http://www.mactools.com/product/tabi...22-mb6901.aspx

Edit: Just read that you already had the stickers off, anything above will work, also try goof off