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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.
In Oil paint, Titanium white is a slow drying pigment so Oil painters tend not to use it in the early stages of a painting. It is also quite a stiff pigment and needs mixing with a medium to give it a good flow and consistency.You can see in the video below how I add medium to a Titanium white oil paint.One of the major advantages with Acrylics is the paints all dry at the same rate â unlike oil paints. This means you have the luxury of being able to use an opaque white throughout your entire painting.ou can see in the video below how I add medium to a Titanium white oil paint. One of the major advantages with Acrylics is the paints all dry at the same rate â unlike oil paints. This means you have the luxury of being able to use an opaque white throughout your entire painting.