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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.
Acrylic. Acrylic paint is ideal on foam core because you do not need to use solvents like with oil paints. Acrylic it fast-drying, durable and adheres to most surfaces. It also has an even sheen and does not need a base coat.ome of the solvents in spray paint may damage the inner polystyrene in the foam board, so it should only be used on the paper exterior. Foam core boards are sensitive to moisture, and spray paint has less moisture than many other paints. It also dries faster than oil paints applied by brush.