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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.
Both oil-and water-based polyurethane can be applied to latex/acrylic paint; however, oil-based polyurethane will create a yellow or amber hue, especially to light colors. To add durability without affected color, use a water-based finish.ssentially a plastic in the form of a liquid until it dries, polyurethane is available in both water-and oil-based options, and comes in varieties from satin to glossy. Water-based polyurethane is popular because of its low odor and low toxicity.