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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.
No! Don't do that! Acrylic and Tempera paint don't mix whatsoever. Although both paints are water based, tempera contains chalk, casein (a milk product), and often times egg mâ¦aking the product more loose and easier to use. Acrylic on the other hand is a thicker more stable paint that contains a plastic blinding ingredient that makes it oilier and more permanent!