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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 paint consists of pigment that uses mineral spirits and acrylic resin for mixture and suspension. In contrast to oil paints, acrylic paints are extremely fast-drying and, in some cases, require only 60 seconds to provide a dry surface. Many acrylics are noted as drying down at a slightly darker color.