yeah you can just water it down a bit so it can run through the air brush, i use acrylic because i'm a tightwad and the face masks annoy me. you can get a airbrush, a good one like an iwata clone for $90 these days from total tools or a good tool shop
oh cool, I actually have one of those sitting in my garage. I'll have to look into getting an air brush, the medium looks/sounds so fun. Thanks for all the info!