I'm new to the board so hello! After 30 years of modeling, I'm finally getting into airbrushing (or trying to). So far, I've painted about five projects using a double-action Aztek but each time I get the same result. Every paint job comes out with a very fine, grainy finish simular to a Tamiya primer. I've tried different nozzles, paint/thinner ratios, air pressure and so on with the same result. The only thing I can think of is that I've used only Tamiya paints so far. Any suggestions? Thanks. Tom