Now me, being the suspicious sort that I am, would, at this point be wondering, "Did my pinhole eat its way in from the trunk, or out from between the skin and the inner shell? And is it just a pinhole or is it an omen of a larger problem??" Yeah, I know, a huge dump of cold reality on a fantastic job. I am wondering because a lot of that surface area that you just blasted is hollow, it has open spaces and pockets because of how the inner skin was stamped. Those are moisture traps, which betray the damage they can cause via the pinholes that you just mentioned. Might be time for step two and a serious injection of that Ofospho solution, possible under a small amount of pressure, to drive it into the cracks and crevices where man can't go otherwise. After that, Mig, Tig, or, as suggested, metal loaded body filler. Out of sight, away from comment.