Newby Sub questions

Yes sir. 

Ha Yes, that is what I mean. So rust streaks are fairly limited to places where drain holes might be and the light grey is sea water stains?

Theuns

Nice!  I’m a sub guy. Built a few. After base coats painted but before any of the final weathering techniques, I applied black oily wash to all raised and recessed surfaces of boat, waited a few hours to semi-dry then removed excess from all. This creates depth and shadows.

For weathering then, I used a combination of white/light grey and rust color oil paints thinned to dot areas of salt water drainage and rust. Let sit for a few hours or longer then with thinner and thin brush I pulled down the dots on water drainage and rust dots and then softened and blended with q-tip. 

The decks are dark stained wood but over that base color i used a washed out tan oil cover to try to highlight worn areas. 

 I have several 1/350 I’m not going to build and would sell.  

I am pretty new to Subs as well, working myself up to a 72nd U-Boat. But i do know that U-Boat decks were painted black though of course this would fade and wear over time. From what i can tell, WW2 boats did not rust much either, and i can't see there being a lot of chipping.