As I posted above, I don't think anyone has created progressively aging u-boat skins.
You can prolly head over to u-boat.realsimulation.com and d/l some different skin packs and try to formulate a set yourself. I mean, it's not just rust, you'll prolly want to camo your boat in mid-42 or so and then un-camo it again in late 43, for example.
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