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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.
The bottom line is that you can use all kinds of brushes with acrylic paint but there are a few differences to be aware of. While natural-hair bristles (like the stiff hog bristle and soft sable) are commonly recommended for oil painting because they cope well with the heavy texture of the paint and maintain their shape even after many uses, brushes with natural hairs can be damaged by acrylic paint over time.