Most paints are a form of enamel or lacquer, and will be fuel safe. If you allow the paint to dry for an extended time you will not have any trouble . I used good old testers model paint to do a cowl for a Sig Kadet. The only problem this one had was a little fuel staining from the die in the glow fuel. The paints like Rustoleum are an Alkyd enamel no acrylic and will cure very well with time. If you are getting the paint in a pint can or some other bulk form they sell what is called " Japan drier" this will help the paint cure.

If you go with an automotive touch up paint, these are lacquers and and really fuel proof but are brittle so will tend to crack easier.

Andy.