Airbrush related

would you have to thinner down Tamiya paint so you can use them with an airbrush?

Yes, otherwise it would be too thick..

you can airbrush it as it is, i have many times especialy with the XF range. but you need to run the needle further in (more open) and have the pressure a bit higher. its ok with flat paints but not too great with gloss.

i would suggest 2 parts paint to one part tamiya thinner to get a decent consitancy

the easiest thing to remember ... when mixing paint for an airbrush .. you want it just a little thicker then milk ... (not by much)