Fiberglass repair/finishing Deck coat

[jobu]

I've done some fiberglass work but never finish type work. What is the easiest way to finish the rough look after sanding? I assume skim with some type of bondo/marine tex...what is the best application. I am planning on fixing some cracking on the deck. Also whats the best product to coat the floor surface when done?
The panels where re-caulked poorly and look shabby...any suggestions??
Thanks for your help. Joe (newbie)