I like to mix up some 5min epoxy thinned out with alcohol. About 50/50 mix and then brush it on. It will still yellow a little, but is 100% fuelproof and light. If you want a clear finish for looks, a clear dope like balsarite will also work. Be careful when using non-model brand products like minwax. Not all polyu's are equal. Clear lacquer is fuelproof, but will yellow with time.