Came across this site some time back while researching airbrushes.
Airhead Airbrush
Have
NOT dealt with them, though. Got sidetracked & haven't bought a decent one yet.
BTW, I've got a cheapie & have worked with it some. I would NOT recommend using one for an entire case. A touch-up gun would be better suited.
An airbrush is for fine detail work - it's small spray pattern would make it really tough to get even coverage on a large surface!