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I am getting better at airbrushing, but now I have noticed something weird:
Single, large grains on the surface.
Color is Tamiya, thinned at 1:2 paint:thinner, plus a drop of retarder, at 20 psi.
Coat is super thin, not comparable to what I am used from brush painting, but these spots are weird. Could that be some kind of dried paint residue in the airbrush that got carried out? I swear I always clean this thing like a benchrester cleans his barrel. Googling didn't help.