After seeing cute posts like this one I decided that we too needed to try our hand at making this "amazing" play dough.  Maybe all conditioners aren't created equal.  I don't know what went wrong but we had either super crumble mess, or gooey runny slop.  Back an forth we added more cornstarch, more conditioner, adjusting the balance to no avail.  When we'd get it just about right it would change consistency and get really crumbly.  Yes, my hands felt like they'd just been to a spa...staffed by the Blue Man Group. But we did have fun.  And the stuff is really easy to wipe up.  So it was a success, just not the success that I'd planned.