Well that's the point, U-boats were repainted in port. I have to agree with Kpt. Lehmann on the rust issue. Sure the boats recieved weathering while on patrol, maybe even picked up small bits of rust. Much algae wouldn't have had a chance to grow, as the U-boat would of course have been moving for the patrol. You usually see algae on the keels of museum ships that are permanently docked.
All in all it's more realistic to have cleaner uboats than rusty ones. The majority of old photos show this (especially the colour pictures, as you can see that the weathering is not rust), some have a bit of weathering but very few are rust buckets. The ones which appear as such are usually surrendered U-boats that have undergone a depth charge ordeal. Yes, I know this is only meant to be a fun skin.
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