White or Black, opaque, matte, ground acrylic. Works well as a primer on most surfaces. Including canvas, wood, paper, metal, chipboard, fabric, plastic, etc. Dries quickly. Works well for variety of color products providing smooth, non yellowing chalky background. Gesso is water based but permanent and flexible after drying. Apply with paintbrush, texture tool, brush, or palette knife. Non-toxic. Archival Safe.