Okay thanks guys. I did find a lacquer clear coat by Dupli-Color. I applied it in light mist coats. Appears to be no problems. Here's a pic. Also it is my Avatar now.
I just finished an elaborate water based quad color livery on a Coota amphibian that I bought as replacement foam parts. I remembered a tip from an old foamie manufacturer about using water based polyurethane (Minwax) as a topcoat to fuel proof & protect the paint on their nitro powered foam models. Went to Wally World on the way home from work & they had both full gloss & satin gloss in spray cans. Definately NOT CHEAP, but easy to use & did a great job!! Flash dries in about 30 mins. & full cure in 24 hrs. I have had acrylic painted warbirds "water spot" when it starts to rain at the field.
Water-Based Polyurethane is good stuff. Does not attack foam, is chemically resistant to almost everything, No toxic fumes, easy cleanup until it dries. I use it as a sealer and as a resin for fiberglassing surfaces. Cheaper, safer, and easier to work with than Epoxy. Lighter, too.