The baking directions for Sculpey depend on the type of Sculpey, but bake original Sculpey at 375 degrees Fahrenheit for 15 minutes per every 1/4-inch of thickness. Put Bake & Bend Sculpey in the oven for 20 minutes per 1/4-inch of thickness at 285 degrees Fahrenheit and bake Sculpey III for 15 minutes per 1/4-inch of thickness at 275 degrees Fahrenheit.
Before baking Sculpey products, pre-heat the oven to the correct temperature, which is on the package. Use an oven thermometer, if possible, in addition to the oven temperature on the display. Ensure that there is good ventilation when baking, and if you are unsure about the accuracy of the oven, run a pre-baking test.
To run a pre-baking test, pinch off a small piece of clay and shape it into a disc that is about 1/4-inch thick and 1/2-inch in diameter. Bake the clay according to the information on the package, and then remove it from the oven when it's done to check the color. Any dark areas mean that the oven is too hot, so lower the oven temperature by 10 degrees and try the test again.
When the test is complete, bake the clay piece on a metal or oven-proof glass at the time and temperature on the package. Do not use a microwave and do not go over the baking time or temperature.