This one I had to try out, Polymorph. A new generation of commercial plastics with unusual properties. When submerged in water heated around 60˚celcius it turns from opaque to clear and becomes workable. Upon cooling down it returns to a strong rigid plastic. This process can be repeated and reheated over and over again. A very cool product with many great uses. I just couldn't come up with a single one? So, when all else fails make an ash tray!
Polymorph, 1kg = $69.95