After analysis, the problem has been deduced to be a reaction between the reducer and the white paint. This caused fisheyes. The rest of the clear coat was fine, with orange peel. The peel was not as bad as I remember from rattle cans, and a bit of hand polishing would make them good. Using 600 grit wet sanding, I flattened the fisheyes as much as possible. At the same time, I removed as much of the dirt speckles as I could. This was a very good practice for paint correction techniques. The next step will be to clear coat the repair, and the panel should be good to go. I won't be using reducer this time. In any case, the gun's air jet has enough power to deal with thick paints to not need reducer. Thick paints could be handled with higher pressure, or, non-intuitively, lower flow.