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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.
How to Dry Oil Paint Faster. 1  Use drying mediums. 2  Environment Let the painting dry in a non-humid larger room with well circulated air. 3  Paint in washes or thin layers.  Different pigments and brands of oil paint having innate drying 1  times. Linseed 2  oil. Use a fast drying paint.  Use acrylic paint for the 1  background. Paint on flat surfaces.