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I tested on epoxy primer, 2 part high build primer sealer (both flashed and also some that dried for a week) sanded and cleaned, on top of 1 and 2 coats of fully cured (a week) then 600 grit sanded basecoat, and even scuffed and super clean bare metal just to see if it could be the underlying surface.
Mini bubbles appeared on every single test panel in the same way.
I tried every 5 PSI from 15 to 40.
It's possible it's the gun. However, I followed the spec sheet for the paint to a T. A 1.2 tip should be just fine and in fact is recommended (1.2-1.4mm). Truly you can shoot small stuff with 1.2 and I have even done 0.8mm with proper adjustment to volume and pattern and distance.
If it's the gun or my lines or my technique, another brand/batch of paint will not fix it and I will eliminate from there. That's my next approach.
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