yeah it was because you airbrushed it on wet RI. Airbrush paint will bead up when something is wet. If you have pearl dust I would mix some into the RI, then go over it with a alcohol/dust mixture and a teeny brush once dried. Sucks, but that is kinda what you have to do. You might be surprised that it's easier that way.
7/10/14 at 7:34pm