Airbrushing makes painting so much faster. I actually tried it on Nids too and man, awesome for batch painting.
Then you should get one yourself too! I'm pretty sure you have more disposable income than time!
Its a totally worthy investment. I know the initial cost of pump, regulator & brush + ventilation booth seems like a cash sink but you save paints, save time, save the environment from not using aerosol cans plus you can do certain techniques hare to mimic with a traditional brush.I highly recommend airbrushes.