shooting primer

sounds like solvent pop....then again I am no paint expert.

make sure your primer to thinner ratio is correct....I think most primer is 1to1 (50/50) I always mix a tad heavier on the primer side though.

If you covered everything and still cant figure it out...you may want to try some fish eye remover.

pictures would help though and someone could give you a better idea as if its solvent pop or fish eyes from surface contamination.