White Gesso Matt Opaque. Prepare your acrylic surfaces with matte Gesso. This perfectly white Gesso is pre-measured, non-yellowing and ready to be applied to all porous substrates, including canvas, paper, stone or plaster. An ideal undercoat for paints, this Gesso dries in 30 minutes and can be sanded. Cannot be mixed with turpentine or oil paint. When painting on a porous surface, it is recommended to apply 2 cross-coats beforehand, then sand them. It can also be used as a primer to prepare your oil painting surfaces. The tools used can be cleaned with water.