I had trouble with Super Sculpey breakage. A dollmaker I took a class from suggested 50-50 mixing with Cernit and that seemed to be much better.
I've got some of the Bake-and-Bend Sculpey - they quit selling it in open stock where you could just buy flesh tones of beige or brown etc. But I did e-mail the company and also got the suggestion to mix it with regular Sculpey. Haven't tried yet but glad to know it's possible.