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!
Step 2: Materials Needed
Mineral Oil (or Baby Oil)
Step 3: Crumbles
Here is how to fix that, get your crumbling sculpey and lay out out on a surface you don't mind getting oil on.
Step 4: Oh BABY oil!
Mineral oil is the best, however you can use baby oil.
Mix the oil in with your fingers. If you aren't wearing gloves, your hands will get the color of the clay you are working on, all over them. Don't fret it will wash off.
You can put oil in a mason jar with the clay or a zip lock and let it soak a while first before working in the oil.