Like anybody else, I occasionally get defects in my finish.
Here I had several bumps in the poly (GF High Performance). I think people generally call these "dust nibs", but looking at them under magnification, I am not so sure. I am suspecting that these are actually contaminants in my poly, or else maybe a bit of spitting. I filter the un-thinned High Performance through a 226 micron filter and spray with Fuji Minimite 5 and 1.0mm cap set. Maybe I need a finer filter ?

I can't scale these, but all are clearly visible to the eye. "A" was actually bigger, but I already knocked the top off. (it had the same dome shape as the other two images)

Do you have a good guess at what these are ?

Hi,

Try using a 1.3mm air cap, this should take care of the issue.

Hope this helps,