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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.
A quick answer for you. use oil and acrylic paint. use the paint of your choice but i recommend acrylics. but be sure that you treat you canvass with white paint or gesso before you paint on it. use brands like Windsor and newton, grumbacher, sakura or Le Franc & Bourgeois. prsegovia Â· 1 decade ago.