I did an SNJ in latex interior wall paint. So easy to get the colors I wanted and no need to try to match film covering colors to paint the cowl, etc. BUT, it is definitely NOT fuelproof.

To fuelproof it, use Carver-Tripp waterbased SUPER Polyurethane. Be sure to get the SUPER, the regular is right next to it, and is not fuelproof ( Minwax waterbased poly is not either).

I brushed everything on with a foam brush. Thin the latex 2 parts paint to 1 part water to avoid brush marks. Takes several coats to get good coverage.

I brushed the super poly on with a foam brush, too, but found later that it sprays great right out of the can and really gives a good finish. I used a HVLP sprayer. (next time I'm also going to spray the latex).

You can use any kind of gloss in the latex. The final finish you get is determined by the Super Poly, semi or high gloss. Flat or semigloss in the latex gives the poly a better surface to adhere to.

George