The clear glazes in this category are for applying over underglazes. The IN1001 is a fully non toxic firable glaze. It fires at cone 06. It is dinnerware safe when fired at cone 06. They come in 4 oz, pints (16 oz) or gallons. Dipping glaze in gallons available upon request when checking out. Please request it in the coment section. This is the recommended glaze for schools and institutions. This product, like all clear glazes requires 2-3 coats in its application. The GL612 is also a clear glaze for application over underglazes. However this glaze does contain certain engridients that merit a caution label on this product. If handled according to the directions and fired at cone 06, it is a dinnerware safe glaze and is probably the best clear glaze on the market. Not for use in schools or institutions. They come in 4 oz.,pints (16 oz.) or gallons. Dipping glaze in gallons available upon request when checking out. Please request it the coment page. This product, like all clear glazes requires 2-3 coats in its application.