The Fimo brands of clay have recently (as of 2007) undergone a reformulation. Due to this change, they can be cured at a significantly lower temperature than most other polymer clays. Previously, instructions indicated that it should be cured at 265°F (about 130°C) for 30 minutes per ¼ inch thickness. Now, however, the package indicates that they can be cured at 230°F (about 110°C) for 15 to 30 minutes per ¼ to ½ inch thickness. The most recent word is that these brands of clay may still be cured at the original temperature-- they just don't need as high a temperature to successfully cure.