I'm putting together a plan for building a Mini-Vardo. The plan is posted in the HF trailer contest thread. It's roof will be rounded from side to side, instead of front to back like a tear drop. Anyway, I was curious if anyone has used an elastomeric roof coating on a trailer? I want to coat the plywood roof with epoxy first as long as the styrene in the roof coating won't react with it. Gotta check into that first. Here's the product I'm wanting to use.
White Seal Elastomeric 100% Styrene/Acrylic Silicone Coating/Sealer

http://www.lancopaints.com