Hello!
I've just uploaded in the post below a step-by-step tutorial about painting Commander Dante's jump pack with the NMM technique.
It was fully painted with a brush (Winsor&Newton series 7 size 2) so don't worry if you don't have, or don't know how to use an airbrush. I don't know how to use it well so I paint everything with a brush :D
Regards
Flameon