Found this on the Sculpey website- Hope it helps :)
"If your clay is just a little dry or firm, it may only require the
addition of Sculpey Clay Softener to reconstitute it (about 6 - 8 drops
per 4 oz clay or 2 - 4 drops per 2 oz clay).The Clay Softener will not restore clay once it has become very hard
or after it has been baked. If the clay is already crumbly, it has
either had too much exposure to heat or old enough to have already
undergone some chemical changes. At this stage, it cannot be
reconstituted satisfactorily.
Adding a pinch of Sculpey MoldMaker to clay that is a little dry or firm will also help reconstitute it."
http://www.sculpey.com/faq-new/209#
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