I’m going to blame the tree-huggers for this one.
They used to use zinc chromate primers on aluminum and they they put an epoxy paont over that. The zinc chromates were banned by the EPA, so now everything corrodes quickly. Everything is fine until the paint layer gets its first pinhole, then the aluminum is zoomed. The reason older aluminum hulls were OK is the primers that were used and no longer allowed.
And people wonder why manufacturing is moving off-shore. We are exporting imagined pollution and real jobs.
EPA banned lead based paint on metal air conditioning cooling towers a few years ago.
Instead of lasting 10-15 years they now fall apart in 3-4 yrs.