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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.
When you are working in oils over a bought prepared canvas, you are probably working over an acrylic foundation. The canvas is covered in a gesso type preparation that uses an acrylic binder. The oil paint adheres as there is porosity in the base preparation and this is considered very stable.