Clear Gesso A very clear size and ground that keeps the working surface visible. Clear Gesso provides an ideal degree of tooth for pastel, oil pastel, graphite, and charcoal as well as an excellent ground for acrylic and oil paints. This gesso is ideal for painting over colored or patterned surfaces. 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. Fluid in nature Reduce viscosity of heavier paints and gels Includes 8-oz / 237ml bottle of medium Intermixable with Liquitex Professional Acrylic Paint Colors and Mediums. Conforms to ASTM D4236; Safe for educational use