High temperature kiln wash prevents glass from sticking to kiln shelves and molds. Each batch of Bullseye Shelf Primer is kiln-tested to ensure consistency from run to run. Includes illustrated instructions on proper application, drying, mixing, precautions and storage. One 5 lb bucket will coat about 150 twenty square inch kiln shelves. Delphi Tip: For the perfect consistency mix 4 parts water to 1 part wash. Apply with Haik brush.