Liquitex offers the broadest range of acrylic mediums to inspire creativity at every stage of the painting process. Surface Prep Mediums are used to seal, prime and add tooth (for color adhesion) to all surfaces such as canvas, wood, paper and metal. Liquitex Super Heavy Gesso Surface Prep Medium is an innovative impasto acrylic gesso used to prepare painting surfaces. It creates thick, sculptural applications and is an excellent ground for acrylic and oil paint. An excellent base coat primer for many applications, it can be mixed with acrylic color to create a tinted ground.