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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.
Primer suited to your chosen painting medium: gesso for acrylics or oils, oil primer for oils or alkyds, pastel primer, absorbent gesso for watercolorsâ¦ take your pick! A very small amount of patience! Step 1: First, ensure your surface is clean and free from dirt or oils.