Paint for inside a galvenized refrigerator

[joemey]

I would like to coat the inside an old Coca-Cola refrigerator that I have. It is made out of galvenized steel. The sides are in fair condition, but the bottom has some rust. There are shelves that set on the bottom that I am currently having made out of stainless steel, but before I put them in I would like to do some preventative maintenance to the steel. Besides wire brushing the rust and cleaning it with a brillo pad I wonder if there is a safe paint or product I can use to seal the steel from future rusting.