M_Boats: Deck Painting

The previous owner of *Tea *M17 #406 painted her non-skid areas battleship gray. As I am not a navy man and I would prefer not to have to deal with the hot decks this colour would induce, I am starting the planning on repainting it. My question is: How much paint to buy to paint the decks and cabin top? I am thinking 2 quarts, but I would like to get a better idea before I order. Thanks Art M17 #406 *Tea*