Polymer clay was developed in the 1930s and was used by its creator, but was not available to the public until the original formula was sold to Eberhard Faber in 1964. That's when Fimo emerged in Europe as a child's toy and as a material for making dolls. In the 1970s Fimo travelled to the United States. Meanwhile Polyform was developed in the United States and was on the shelves in 1967. Later Polyform became known as Sculpey, the oven baked polymer clay. It comes in 44 colours and is the basis for a wide variety of crafts. The crafts and creations are baked and painted. One of the secrets to successful outcomes with the final product is proper baking temperature and time.
Preheat your oven to 135 degrees C, Fahrenheit.
Place Sculpey shapes on a baking tray ensuring that the shapes are all the same height so they will all cook evenly.
Let the Sculpey shapes bake for 15 minutes per quarter-inch of thickness. If the item is thick, lower the temperature to 129 degrees C and let it bake for up to 60 minutes.
After baking for the required time, take the pan out of the oven and let the shapes cool naturally. Baking will continue until the shapes are cooled. The length of time, temperature and thickness will ensure that the Sculpey item is done.
If your oven runs hot, use a lower temperature. If your Sculpey items come out too brown on top, place an aluminium foil tent over the item on the pan,
As tempting as it is to touch Sculpey work to make sure it is done, do not. This can damage the shape while Sculpey is warm and still soft. Do not use a microwave.