WeatheringMy plan was to keep this boat relatively fresh-looking, without a ton of battle-scars or years of mistreatmeant under horrible conditions. Despite that the salty sea-water should've left some marks on the surface, espacially where the water might be pooling for longer times than on the smoothest surfaces.
A rusty washFor this stage I dug out my Vallejo rust liquid (VMW 76506 Rust) and applied it pretty carefully here and there. I mostly concentrated on the conning tower and the numerous openings of the topmost hull. On those I typically dabbed a bit with the brush and pulled it down gently for a drip-like effect. The stronger ones I then smeared with my fingers to make them look a bit subtler.
Messing with pigmentsI had thought I'd try out the fresh rust pigment (VP 73118 Fresh Rust). The point was still that the effect wouldn't be too strong, but as I'm a total amateur with them, the expected result wasn't guaranteed to be perfect.