Sculpey is a polymer clay most often used for small crafts. This clay starts out with a soft, pliable consistency -- which makes it easy to work with -- but then goes through a curing process to harden it into a permanent shape. Baking is the recommended curing technique, but boiling may work just as well for small projects, preferably with clay pieces no thicker than one inch. This technique reduces the risk of cracks and may even help the clay retain more vibrant colours when compared to the baking method.
Fill a pot with hot water and put it on the stove at high heat. The water level must be high enough to completely submerge the items.
Drop the Sculpey items into the water, once it comes to a boil. Do not add them to the water before it boils as it may cause them to absorb excess moisture.
Boil the Sculpey items for four minutes. Remove the pot from the heat.
Pull the Sculpey items out of the water with a pair of tongs. Lay them on a sheet of paper towel. Pat them dry with the paper towel.
Do not use a pot that is normally used for cooking as the polymer clay may cause food contamination.