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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.
Now lets take a look at the types of acrylic mediums and additives you can use with acrylic paint: Gloss Medium, Matte Medium, Glazing Medium, Gel Medium, Modeling Paste, Texture Gels, Retarding Medium, and Flow Improver. Few Parting Tips. 1  Always mix in the medium after you've mixed the colors together. 2  Don't use oil mediums with acrylics because they aren't compatible. 3  Some medium products claim that they can also be used to varnish your paintings. 4  I recommend you use a removable varnish as a final top coat instead of a medium.