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You can use a small amount of talc, even if you use too much and clog the airbrush you can clean it all up with lacquer thinner. But you probably won't need it.
Raise the air pressure (to around 25 psi) and lightly build the paint up in a few thin dry coats, also using lacquer thinner to help it dry faster. That should give you a non-gloss finish... - Mark
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