It is not an enamel based paint on those radiators, its EXACTLY the same as the Anti-corrosion chemical applied to 99% of all of radiators, this one is Black though in order to help its heat transfer just as Alpha HSF's are black.
If you wanted to strip them you would need to bead blast em. ( which isn't such a bad idea... but be careful the thin Al. channels would erode away fast.( while sand blasting)
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C-ya
Joe
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