I use 3 kinds of Airbrushes.
Testor Body Airbrush. <Excellent for your painting Militray single colors on armor. Or Autos>
Cheap 12.00 Harbor's and Freiates pos. It works, can really complan.
Pachae, Pashea, Pac something a rather. One of them really expensive airbrushes. <I use this for very fine detail or just using it on my art work.>