FAA 14 CFR Part 43: “Apply preservative or protective material to components where no disassembly of any primary structure …. where such coating is not prohibited or contrary to good practices.” I’m cleaning up areas where paint was compromised, then iso, alodyne, epoxy primer (the white layer) and will be able to feather and start applying color in a few days. Almost caught up with 40years of wear into my 6th year of ownership.