We carry two different glazes for use on porcelain and other high fire clay bodies. Both are what we call wide range glazes. If you are wanting all over coverage you can apply them to porcelain and take them all the way to a cone 5-6. If you are wanting to spot glaze and don't want the glaze to travel then apply to small areas and fire only to cone 02-03. At both temperatures you will get a high gloss glaze that is superior to others on the market and free of crazing.