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It depends on the type of paint used in the existing painting. If it is an oil painting, you will need to use oil based paint. If it is a water based medium, like acrylic, use a water based paint. Gesso will work well for this. It is inexpensive, opaque and will help level the texture of the existing painting. You may want to lightly sand the painting before painting over.
If you talk to manufacturers reps, they generally try to over-engineer roof systems due to the beating they take. I have seen people use acrylics over an oil primer, linseed-oil based paint over oil primer, and cheap fibered aluminum coatings. You may see 2-4 years out of these systems.