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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.
First, Acrylics are probably your best bet as a beginning medium for painting. Acrylics are fast drying, water soluble, and provide for easy clean-up and quick corrections. For painters used to working with oil, the fast drying properties of acrylics can tend to be a bit bothersome.irst, Acrylics are probably your best bet as a beginning medium for painting. Acrylics are fast drying, water soluble, and provide for easy clean-up and quick corrections. For painters used to working with oil, the fast drying properties of acrylics can tend to be a bit bothersome.