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What Is a Plaster of Paris Primer for Oil Painting & Acrylics?

April 26, 2017Acrylics Oil painting Paris plaster primer

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What Is a Plaster of Paris Primer for Oil Painting & Acrylics?

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Plaster of Paris primer, commonly referred to as gesso, is a traditional primer used for both oil and acrylic paints. Ground from gypsum, plaster of Paris is a fine white powder, calcium sulphate hemihydrate, CaSO4 2H2O. When mixed with water, rabbit skin glue and titanium white dry pigment, plaster of Paris forms a thin, spreadable paint. It dries to a reflective, absorbent coating, desired by artists but prone to brittleness and cracking.