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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 Pros: You can paint on anything. This is one of the key things that make acrylics a great medium to start with when beginning to learn to paint. To be able to set up quickly, start painting on anything is brilliant. Paper, card, canvas board, whatever you have to hand. Acrylic Cons: They dry quick, I mean really quick.