Use this water-based primer to allow Milk Paint to adhere to a variety of materials, including metal, painted, and varnished surfaces. This non-toxic formula can be used as a durable acrylic sealant and dries to a flat, matte finish. Versatile as both a primer and sealer, this step is perfect for adding a layer of protection to your Milk Paint projects and cleans up easily with soap and water.FolkArt Milk Paint Bonding Primer and Sealer, 6.8 oz. 1 pack of 1 piece