Seems to be a fairly controversial topic but looking for the latest thinking. Just started blasting my panels, and want to stop cancer while working on driveline. So after media blasting to bare metal to the point where I cannot SEE rust, it seems that at a microscopic level, there must be some residual rust remaining. Logically, it seems to get it all, a light wiping with a rag (not heavy brushing) of a phosphoric acid based etch, let dry overnight, wipe with a wax/grease remover (DX330 for me and a PPG system) would be best before applying an epoxy primer. MSDS link for PPG primer below.
Doesn't seem to be a consensus, but if you guys tell me you've skipped the etch, and had perfect paint for 10 years, I'll let it go. Appreciate your experiences.
PPG Primer Link
