I have just bought a HP printer with RIO in the toner to make my own decals. Attached the decals to my fired glazed pieces and fired to cone 04 and tried cone 06. Decals look amazing but the glaze pitted, bubbled and felt like sandpaper. I have been told that it is probably the glaze that does not like to be re-fired. If you can give me any help on this I would really appreciate it. TIA Nancy