I never had any problems airbrushing craft acyrlics.. it all just went on smooth. It just isn't durable enough and I never could get a good gloss with it so I have moved to lacquers.
I decanted some Duplicolor Sandable Primer that I hear so much about here and tried to put on a light, first coat so I wouldn't get any crazing. It came out like sandpaper (see photo below). What am I doing wrong? I shot it with a Paasche H, #5 needle and nozzle at between 25 and 35 psi with the same results.