RE: foam rc airboat fiberlass????
you can get a 1 qt West Systems epoxy kit for 40 bucks and enough 6oz cloth to cover a project that size for about 10 bucks. if the foam is porous then put a coat of the West epoxy on the foam and let it harden, then sand it with some 80 grit and then lay the glass over it and any imperfections can then be bondo'd and sanded.