I developed my Kiln Guard to help protect the top brick on electric kilns. You simply brush it on, let it dry, close the lid and fire as normal. The higher you fire, the harder it gets. It’s also been used as a mortar to reset arch brick in gas kilns and coat the chamber face brick on car kilns with great success. Brush some on a broken brick in your studio and fire it under your conditions before coating your kiln with CP’s Kiln Guard.