Originally posted by cleen X
I guess you would not do a whole lot with a airbrush on a 30 mm figure

? Maybe basecoat but nothing more?
At the most basic you can use an airbrush to establish zenithal lighting by, for example, priming grey and then spraying white from above (plus maybe black from below). You can also prime black, spray heavily in grey and then spray more lightly in white, pointing directly downwards.
But if you\'re willing to put in the effort on masking you could do a lot of the painting by airbrush, even on minis.
Originally posted by cleen X
Anyways, its the vehicles I want to know about
Many vehicle modellers don\'t highlight or shade their models. Others do but not as we would understand it.
There are many techniques that do some basic shadowing, from preshading (spraying dark paint into panel lines before going over with the base colour), plus colour modulation and a rudimentary kind of zenithal lighting to name a couple more. But a lot of \'shading\' is not done with the airbrush, but with washes.
There are dozens of painting methods for vehicles that use airbrushing to one degree or another - that\'s why there are entire forums dedicated to nothing but armour, aircraft, spacecraft etc.
Einion