There are a couple of things I do to make sure that it's all fuel proof, first, I either prime my work with a 2 part fuel proof primer, or I seal it with a coat of clear first. The base coat is a poly base, but it is one part and not fuel proof, it's not even glossy for that matter. Once all your color is applied, you spray a component type clear (2 parts plus reducer).

If you haven't painted with these types of paints before, let me stress this.....

USE A GOOD RESPIRATOR!!!!!! these paints are highly toxic and will damage your respiratory and in some cases nervous system very badly. They are also cumulative meaning they will never leave your system. Also, cover up as best as you can, don't spray with short sleeves and no gloves, get a disposable paint suit, they are like $10 and have hoods that will cover almost all of your skin.

I did a painting tutorial on here that you may want to read over, it will probably help answer many of your questions.

[link=http://www.rcuniverse.com/forum/m_745346/mpage_1/key_painting%252Ctutorial/anchor/tm.htm#745346]Painting tutorial[/link]