back when i started painting there was mostly lacquer base paints in the shops i worked in .then over alls were enamels then some lacquer with a urethane clear.. lacquer base makers but still lacqure primers . fish eyes never happen much . but when we started going all urethane there was a chance of eyes .. its slow air drying it was open longer for contaminants.i worked at many shops and some that were just a hole in the wall for painting. i knew of one shop that i worked at if the wind blew the right way from the casting shop next to us we would get small pinning fish eyes .the last thing you what to do is add fish eye killer but some times you do what you have to