Hello , im doing a spoiler prototype , i want to make a mould of this spoiler in fiberglass 
I want mould resists a lot of copys , i thinked the best way os  gel coat epoxy  grey  high temperatures for prepegs, fiber glass , and epoxy resin . The copy will be do with top coat poliester , fiberglass and poliester resin. It is compatibility?
Thanks , sorry for my english