FWIW - SOME of the Rustoleum colors are fuel proof. I don't know which ones, but someone may chime in and be able to tell you.

What I do know is:

If a paint is labled ACRYLIC lacquer/enamel, it is fuel proof. Many, but not all, of your automotive touch up paints are acrylic. If it isn't labled acrylic, assume it isn't. Dupli-Color has a "Truck & Van" paint that is an acrylic lacquer, however, it is a limited selection of colors. Wal-Mart has this for about $4 for a 11 - 12 oz spray can. Just be careful about compatibility. You can put enamel over lacquer, but not the other way.

For a clear coat I can highly recommend a WATER BASE polyurethane. It is compatible with just about everything, it WILL NOT YELLOW with age, it is definitely fuel proof to 10% nitro (all I use) and various reports indicate no problems with 15% nitro, there are no fumes, soap and water clean up, and if you don't have spray equipment, MinWax has it in spray cans.

Hope this is of some help.