Liquitex - Acrylic Surface Prep - White Gesso - 4 oz - Surface Preparations are used to seal, prime and add tooth (for color adhesion) to all surfaces such as canvas, wood, paper and metal. This same preparation is used for both acrylic and oil paint. Our professional gessoes usually take just 1 coat. Liquitex White Gesso Medium is a classic white sealer and ground for absorbent surfaces, such as canvas, paper, or wood. Provides the proper surface sizing, tooth and absorbency for acrylic and oil paints. One coat is usually enough. Traditional gesso is meant to be opaque titanium white for good coverage. Two coats are recommended under oil color.