Blick Professional Acrylic Gesso is ready to use — no preliminary sizing or sealing is required. Apply it directly to a clean surface with a brush or roller. For best results, dilute the first coat with water or acrylic medium for the best surface penetration. Sand between each application for a smoother ground, allowing gesso to dry thoroughly between coats. Hard, shiny surfaces should be sanded before priming. Clean up with soap and water.