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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.
Brushes: use stiff bristle brushes for oils, softer brushes (sabeline/synthetic) for acrylics. Just start with a few in various sizes and see what you like. I prefer filberts (flat shape, but with rounded corners), but you should have one or two flats and/or rounds.est Answer: Decide if you want to paint in acrylics or oils. Oils are more traditional. Beginners tend to find them tricky, but many serious painters prefer the texture and rich colors. Acrylics are easier to layer and dry uch faster.