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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 vs. Enamel Craft Paint. Acrylic Paint. Acrylic paint is a pigment mixed with an acrylic polymer. You can paint with an acrylic paint directly out of the tube for an opaque effect, or you can dilute the paint by mixing it with water to create a lighter wash of color.