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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.
Linen canvas, popular with oil painters for its smooth, stiff surface, can also be used for acrylic painting but is not as commonly used for acrylics. Take a look at our Tip & Technique on âUnderstanding the difference between Canvas and Linenâ. When you use acrylics you can paint straight onto the surface, this is because acrylics will not sink like oils into the material.