I had a similar looking thing happen to one part I sprayed with a pressure pak. I put it down to the paint separating and not being mixed properly before starting, it spat out droplets of solvent first which the rest of the paint wouldn't go near. Since then I shake my cans for the recommended 2 minutes and I have also stopped turning the can upside down and spraying the paint out when I'm done. As for the fix, I just waited for it to dry and gave a few more coats which filled up the holes.
