Duncan Ceramics Cover Coat Glaze, Walnut Brown, 3.5 x 3.5 x 3.5 cm Can be used on Green ware, Soft fired bisque or bisque Provide solid coverage over even the darkest colours Perfect for Airbrushing and brushing Food Safe if a food safe Duncan clear glaze is applied and fired over the top Kiln fire to Cone 06 to cone 07