This kiln wash recipe can be used at all temperatures and in all kiln atmospheres. It is a combination of Alumina Hydrate and EPK Kaolin.
It can also be used as a wadding recipe to set the pieces on in wood, salt and soda kilns. Just mix it up thicker than the kiln wash - like bread dough - and roll it into wads.
Kaolin has a melting point of 3218 degrees F (1770 degrees C) and alumina oxide has a melting point of 3722 degrees F This kiln was is good to Cone 13