Oh yeah, I wanted to add this little discovery. When your working with contact cement and you decide you want to undo a joint you've just glued. You can reach for you hair dryer. Applying heat to the glue makes it realease. And don't worry about adding more glue. The cement will still hold after the joint has be separated.
This affect can also be created by leaving your puppet inside a car in hot weather.

Just a heads up for folks since they may not want their puppet to come apart at the seams in this case.