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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.
The first technique involves a simple dilution of the acrylic paint. Because acrylic paints are water soluble, painters can also mix them with water to create a transparent effect. The level of translucency in the finished product depends on the amount of water used in the paint.With enough water, the effect is as transparent as working with watercolor paints is.o use glaze: 1. For a transparent glaze, mix 7 to 10 parts of the medium in the container with one part of the acrylic paint. Use the back of a paintbrush to mix the glaze, and then clean the back of the brush off by wiping it on a cloth.