Originally posted by aptar
Do not use thinned epoxy over paint. That would make a real mess of things.
If you want to make absolutely sure the clearcoat is fuelproof and will not yellow when exposed to the UV rays of the sun, automotive clearcoats are the only way to go. I have never found any other fuelproof clearcoat that does not yellow and darken the paint.
I second that. All hobby clears that I have tried are yellow. Krylon is not fuel proof. Automotive 2-part clear is crystal clear and fuel proof. It is fairly expensive, but if you keep it climate controlled, it will keep a long time.