>>11346423Upper part of the hull and conning towers is to be painted in Hellgrau RLM 50. Deck was wooden and it was coated with black paint, which very fast started to fade and show some wood color underneath, so just use a dark grey almost black color and maybe add some brown washes in mix.
Heres 49 pages of autism if you want to dig deeper into the rabbit hole.
https://www.u-556.de/images/pdf/uboat_colours.pdf 