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Air entrapment or entrainment on Sapele3/19
We are looking for a technical reason behind a finishing problem we recently encountered.
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your process looks to be pretty solid.... I'd entertain trying butyl cellosolve at 5% with the mixture you have including the butyl acetate you already have there... My theory is that your just not reduced enough for a fairly open pore wood.... usually this problem pops up when your shooting way to much millage on an open pore wood but if your really at 3-4 mills measured wet on a gauge or cheap card I bet you have too much air or heated air passing over your substate and skinning over your coating too soon... thus causing the micro bubbles.... If you can slow the flash down without killing your solid content you will be fine... Butyl cellosolve at 5-8% should help it stay open a little longer without reducing your solids too much and having to apply another coat to keep the finished look and sheen just right..
Have you called Gemini's Technical Support?
Are you sure it was air entrapment?
How long did your PCV550-0030 and CVS-0400 sit before the next set of assemblies came around? Did they get past their pot life?
When you began seeing this problem, did you sand everything back down to remove the bubbles you were seeing, or was it just a scuff sand?
What did you retard with MAK?
What did you thin with N-Butyl Acetate?
When you tested the PC-0430 and had no issues, what was different here, than with the CV?