I could never get nitro to work with my suction airbrush, it just went on very dry and not much of it came out, even if I thinned it a lot. But I think I probably had a 0.3mm nozzle IIRC, the largest that came in the kit, rather than the 0.5mm size McCreed was using. I quickly gave up trying with it and went back to the mini spray gun.

0.8mm with my gravity mini spray gun is fine.