Fired this on test tiles to cone 6 and was smooth, clear and free from crazing.. Also performed well in decal firing at 820C with no refire blisters which was why I bought it in the first place, Also did test tiles to 1290C in gas reduction where it was smooth but more milky. Fired only on porcelain  Looks like a good allrounder glaze for a wide temp range but a little expensive understandably as made and shipped from USA .