[Dave Ottney]

I've blown all sorts of paints through my airbrush over the years. If its water based then I thin with windex or something like it. Auto window wash fluid works well also. The craft store paints and even latex house paints can be used, they just take a little fussing to get the right consistency. Model paints are a bit easier. I tend to crank my compressor up more than has been noted here. Things just seem ti work better with more pressure and I generally like the paint the surface to hit almost dry.
Dave