Looks like it, what kind of paint is that? Pop can be caused by wrong temp hardener/ reducer, to much paint being applied and not giving enough flash time between coats.
The black in these pictures is PPG MTK single stage with SU4985 flattener, the one pic is before it flashed. I also had problems with DCU2082 clear a few weeks ago. I have successfully sprayed both products dozens of times, but I have never painted anything in this kind of humidity and heat (90º+). Without typing a novel, I tried everything short of a slower reducer/hardener because I didn't have any on hand.
That's just a test panel, so it's not a big deal. It would become a big deal if I spent another $100 on hardener and reducer because I didn't ask Thanks
you shouldn't really have any solvent pop while its still that wet. throw the paint on a shaker for a bit. i had flattened single stage (delfleet) do the same thing, it was the flattener. shaking it for a while helped, but my supplier re-mixed with fresh toners/flattener and had no issues.
I had flattener do the same thing also.
It's to fine to get out with a strainer.
Flatteners are prone to this, most don't last long
once opened. I actually removed the specs by straining
some through a coffee filter once, I had to reduce it first
but that worked.
Solvent pop is usually bigger than that and is
holes in the paint film, not bumps.
Thanks, I'll try mixing and straining the flattener a little better. I had it on the shaker for 10 minutes, plus stirring, and I did strain it with standard strainers. I'm mixing on a gram scale so my ratios are right. That still doesn't explain the bubbles in un-flattened clear, but maybe that's a separate issue.
It was the gun. I thought I had tested a second gun, but double checked my notes and I only had problems with my new DeVilbiss GTi with 3M PPS cups. Today I poured the same mixture into my old DeVilbiss Finishline and had no trouble. It's either a problem with the spray pattern on the GTi, some reaction with the PPS system, or a problem with the guy pulling the trigger.