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Aluminium can be tricky to paint even under good conditions. Chromate based primers were the only thing that worked back then. But chromium and zinc are strategic materials (Japan had effectively none) that were better used in industries other than paint.
Today there are non-chromate primers that work, but the road getting there was rocky. I recall TWA having some massive paint failures in the late 80's where huge areas of paint were just blowing off the airplanes
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I'm not making it up as I go along, I'm establishing precedent
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