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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.
Tip #12: Use with mixed media and collage. Acrylic is also ideal for mixed media and collage. The paint and the mediums act as adhesives, and many of the acrylic mediums dry clear. It also makes a good surface for drawing on with graphite, oil pastel, oil sticks, and more. Read: How to Begin Painting.