You are not alone. I have worked with sculpey this hard and it made my hands so sore I wanted to cry. I found out about some great stuff sculpey makes to renew it back to "health" but a small bottle wasn't cheap. If you have an 8 lb size container of sculpey that's gone bad, you would need a truck load.
Then I went to an art confrence and picked up a great tip! I tried it and low and behold, it was like the clouds opened and sun shinned down on me! I couldn't keep it to myself and felt I needed to share with the instructables community.
Let's get started!