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like Dpmulvan stated looks like water in your air supply system.
being you said you buffed them out my guess too is water in your air system. if it was solvent popping then they would be much deeper than just on the top surface.
solvent popping is caused by a few things but the main one is to much material is sprayed at one time with out letting the coats under it flash off long enough. so the top coats you sprayed dry faster than the 1st coats . with the solvents having no wet surface to escape thru and with the top layer/s more dry the solvents push thru the top layers and leave pops in them.
also with spraying to much to fast to soon you can get delimitation problems. this is because the top coat/s have dried well before the 1st coats and the solvents can't escape at all so they travel along under the more dry top coat/s and delaminate the top last coats of material. this you will not tend to see until months or even years later after the car is all finished.
to avoid water the best thing is to get a dryer system. there are a few different ways to dry the air.
there are systems that will cool the air coming out of the compressor but they are costly.
another lower cost way is to install a desiccant dryer. they remove the moisture from the air with beads.
the loop systems will work ok but there are times if your compressor is running hard that you could find some air still getting to the end of your air line.
dry air is a big help not just because it can ruin your paint work when your spraying but it could also be spraying contaminants all over when your doing body work.
a good dryer system will also help in prolonging the life of your tools also.
that moisture your getting at the end of your air hose is also going thru your air tools rusting the crap out of the insides of them.
a desiccant system will run from 150 to 700$ depending on how crazy you want to go.
the time it takes to repaint and the cost of having to buy more materials in most cases will cost you much more than a few hundred bucks to just buy a good dryer.
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