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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.
Apply two coats of paint to the bottom and up the sides a bit, allow to dry, turn the project over and with the dry bottom side down, apply two coats to the top. The acrylic paint will soak into the clay. It is better to use more paint than less.