Have you ever considered using latex ? I use latex on almost all of the painted areas on my planes. After the latex "cures" (7 - 10 days average cure time ) I clear coat it with 2 coats of water base polyurethane to make it fuel resistant.

A couple of pluses to the latex:

It can be color matched (except for metalics ) if you bring a sample of the color in.

Cost runs ABOUT $10.00 per QUART

No fumes

If you screw up the painting, it is easily removed (within 12 hours anyway ) with a wet cloth.

Goes on AND adheres well over almost everything.

Soap and water clean up.