Eraldo Di Paolo Artist's Acrylic gesso is ready to use. A quick drying, water-based bright white, non-toxic and flexible acrylic painting base. Suitable for a variety of substrates including canvas, MDF, plaster, boards, masonry and natural wood. Acid free. DIRECTIONS: Stir contents before use. Apply an even coat with a pre wet brush. Can be thinned with water. Clean up brushes and applicators with water. Recap tightly. Quick Dry, water based, bright white, flexible fine tooth.