Powdercoating candy colour disaster- was it because they grit blasted or paint problem?
I managed powder coating lines in a factory for a while. Crazy stuff can happen! The media blasting could have been part of the problem. The dents were just dents that were not properly repaired. The poor surface finish on the “paint” could be caused by several factors. The blasting procedure will imbed particles of anything that was on the tank to start with. All parts should be thoroughly cleaned/degreased before blasting. They then should be washed in a caustic solution and then rinsed, neutralized, and died. What can occur is that foreign particles can “outgas” during the cross-linking stage (baking) and cause pits, craters and orange peel. A tank will also have another difficult situation, and that is it is a tank! If the openings are not securely sealed during the electrostatic and curing stages, moisture from inside the tank can create the surface imperfections you describe. The curing ovens also must be properly vented to allow moisture to escape during the process. My thinking
