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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 looks a little bit darker dry than when it is wet. So make the paint color slightly lighter than youâd like the final outcome to be. It can be tough to mix a specific color using acrylic paint, so if you are looking for the perfect tone for a large piece or an ongoing series, make notes of the colors that went into the mixture.