by Cap
Hey shadowdude.
I have used my airbrush recently on ARAH, and on both types of plastics. I was trying to really get a good even cover for fleshtones. I'd say that so far, I prefer using an airbrush for applying the color, and it holds up a bit better than my figures that have been brushed on.
The types of media I use are acrylic inks, kind of hard to come by, but they are the proper consistency for use with brush or airbrush, and come with permanence ratings (a series of "*") on the sides.
You could use both acrylic from the bottle or tube, as well as hobby enamels with an airbrush, but you really have to thin them to the proper consistency, or you risk gumming up the airbrush. Also, it pays to buy a bottle of airbrush cleaner. When I set up, I always place the colors I am going to use in their own separate bottles, so I can just switch them as needed, keeping in mind to rinse the unit with the airbrush cleaner and water mix between switching.
You could use can propellant, but in the long run you'll want to buy a nice economical compressor. If you have a Michael's or Jo-Ann Fabric's art store near you, you can score one nicely if you utilize their 40% and 50% off coupons.
Pays to get extra bottles, and an airbrush cleaner key which is a pocket metal box filled with twisted wires of varying thickness.