Not so fast, Sailor ....
After the ship is painted, use a soft paintbrush to lightly apply a very small amount of silver rub-n-buff to all the surfaces that would be metal on the real ship. Then mix a thin solution of charcoal grey waterbase paint and brush it on everything, decks and all, one area at a time and wipe softly with moist cotton just as it begins to dry. This makes the edges look worn and the crannys look old. Once you have the whole ship weathered like that, mix some rust-colored water-base paint and aplly in vertical strokes to parts that would see a lot of salt water exposure, like the hull, lower superstructur and under the waterline.
All of this should be done sparingly, becasue each step adds more and more on top of the paint coat and you can easily cover up too much and have a ship that looks like it was sunk twenty years ago. When you are all done, apply a thin coat of clear flat to seal it all up.
The ship will ook like veteran after that.