I've tested some rustoleum and it was not fuel proof. Others claim it is. Your best bet is automotive two-part paint (I believe they are polyurathane based). You can buy your own (very expensive, have to buy larger quantities than most modelers use), or go to a body shop and have them mix & spray for you, you pay either way. Best bet is either Klass Kote two part epoxy paint or if you don't want to use a compressor, LustreKote.