This is solvent pop, right?

[Afazz]

Among dozens of other reasons, this can be solved by using a slower hardener and reducer, right?

[johnnynumfiv]

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.

[Afazz]

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

[spitfire481]

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.

[JCCLARK]

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.

[Afazz]

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.

[Afazz]

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.