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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.
Liquid white is only usable with oil painting and other variations of the base coat medium are available, like liquid clear, liquid black and liquid opal. If you prefer working with acrylics, and you want to try a wet-on-wet approach to your painting, try the following: wet the canvas with a little bit of water.