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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 is a water-based, non-toxic and quick-drying paint that can be used for many applications. Acrylics are easy to clean and opaque, which means you can correct mistakes just by painting over them.crylic Mediums and Uses. A variety of acrylic-based mediums are used for various purposes with acrylic paint to achieve different effects. 1  Gel retarder is added to acrylics to slow drying time up to 50 percent.