You can spray a primer, then a color coat, or just a color.
If you wanted to go nuts, you can take the metal parts to place in your town that chromes metal. They can dunk it for you and clean all the rust right off. Ask them how much it would cost to nickel plate it after they dunk it. It won't cost that much more. You will have the best chassis in town!
Or you can find some more parts for that apple.....
Mikemike690, what a great idea with the zinc paint! Most of the products I found after reading your post are specifically intended to be used on surfaces with corrosion. "Cold galvanizing" paints seem to be a similar product.