AMACO Wax Resist Apply to greenware or bisque to “resist” application of glaze, slip and underglaze. Wax Resist is Non Toxic. This wax emulsion, when applied on greenware or bisque as a method of decoration, “resists” application of glaze, slip and underglaze. Available in pint or gallon jars. Wax Resist now has a coloring agent to make it easier to see during application. The color will burn off during firing.