Metal roofing type and source

[Obie]

I haven't seen aluminum roofing that crumbled at the edges.

I was stating my own experience.My house and 3 other nearby houses were built in 1975 and they all still have the original roofs.This is about 1000 ft from the ocean in lower Puna.They are all plantation style 2 story houses with fairly steep roof pitches.

According to HPM the Kynar coating can be applied to aluminum.

http://www.custommetalroofing.us/