is it better to air brush the bow before assembly or after?
I've given up trying to paint on gum paste and MMF for now 
and will just air brush 
I can't imagine that you would try to airbrush on the cake!
I think there are a couple of things to consider. One would be what you're airbrishing onto the bow. If it's luster dust, I'd say brush after it's assembled, because if you brush before, all the surfaces will have a coating on it, and it might be nigh to impossible to get them to stick together.
On the other hand...it's going to be a challenge to get all the nooks and crannies evenly covered if you brush after it's assembled.
So...you're going to have to weigh the pros and cons of the particular material you're using. Having said that, I love the finish that airbrushing gives with luster dusts. So smooth and pretty!
Definitely before assembly. It's too hard to get the color inside the loops after it's been assembled. That being said, once the bow is assembled, you'll want to go over it again lightly with the airbrush to clean up any fingerprints and to properly color your 'glue'.
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