Solvent based or H2O Based paint?

[numbskull]

Start with water based paint made specifically for airbrushes. Createx is the favorite. Relatively nontoxic, easy to wash off and start over, not particularly expensive, easy to clean the brush. Downside is that it is fragile and not particularly waterproof, so you're going to have to clearcoat it somehow.........which usually means epoxy (UGH). Most guys using solvent based paints use cans, although if you have a system to handle the fumes and a quick way to clear your brush between colors, solvent based airbrushing probably gives you the best of both worlds (not that i've tried it....yet).