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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.
Once the acrylic and latex paints were produced, it replaced oil and alkyd paints. Though both paints are similar in some respects, they have many differences between them. When latex paint is more used for painting homes or other structures, acrylic is mainly used in artwork. Latex paint is available everywhere, and you can buy them from any hardware store or paint shop. On the other hand, acrylic paint can be bought mainly from craft stores. When latex paint is water based, acrylic is chemical based. As the acrylic has chemicals, it is more elastic than latex paint. The acrylic paint contracts and expands better than the latex paint because of this elasticity. The acrylic paint is more durable as it resists flaking, chalking, and peeling.