RE: fuel proof paint
The ONLY "FUEL PROOF" paint is a 2 part epoxy paint, the rest are FUEL RESISTANT (to varying degrees - Ultracote ststes to 15% nitro after 72 hours ).
That being said, SOME of the Rustoleum paints are fuel resistant/proof, but not all of them. If you have particular colors in mind, list them and someone should be able to tell you if they are fuel resistant/proof or not.
If you are not sure, AFTER THE PAINT COMPLETELY DRIES, you can clear coat it to make it fuel resistant/proof.