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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.
Best Answer: Since you'll be working on canvas, you will need to use a paint that is flexible after the painting is dry. That leaves you two choices: oil paint and acrylic paint. Acrylic paint will remain flexible for longer than oil in years to come, but in the short run, their flexiblity is comparable for about 10 years.