I used liquid mask and Faskolor water based paint. The air brush was used for the liquid mask. It took about four good coats to build up enough to allow for a good score and peel. Maybe I'll try brushing next time to see the difference...
I didn't want to spend extra money for a hobby compressor, so I just used my shop compressor at 50 psi...

I can't imagine ever rattle canning a body again! Water based paint with an air brush was awesome! No nasty vapor, easy cleanup, and much easier to navigate the inner angles of the body with a small air brush.