Joe is deman on this subject, but I have always automotive base coat for my base colors. I have used the primers as on Joes site. Then I used a fill coat to cover well to stop any transparecy issues from cropping up when using candies or transparent blending colors. Then I used a silver similar used on motorcycle paints. After this I came back with color and blended 3-4 were I wanted them and clear coated everything after it cured. The I sanded with 600 grit and with 1000 grit and shot a last clearcoat for a durable hi-gloss shine that will not soak up. I use a touch up gun, but the off brand guns I had bought for 20 bucks at a flea market worked great as well.

I would go with the automotive paints if possible, you can buy aeresol cans of fuel proof paints at your local hobby stores as well.