Fish eyes are a result of a contaminant either on top, or imbedded in an un-properly prepared surface. The problem becomes worse if applying a top coating to thick. Applying primer over a surface possibly contaminated with whatever is a band aid and will come back to haunt you. When doing spot repairs on cab roofs, etc, there’s usually smoke fluid imbedded in the paint that normal soap and water won’t thoroughly remove,….my trick is to use Ajax powder and water, mixed into a slurry, and scrub the panel I’m working on,….this will kill two birds with one stone, it will properly clean the panel, and it will scuff the area ready for coating. Ajax mixed into a slurry is the equivalent of 1000 grit, ideal for model work,…if still gunshy about respraying, apply the first coat light and uniform, and allow that coat to flash off,……BTW, I hate rattle cans,…they make me vomit,…😉
Pat
