Wonderflex? is an extruded thermoplastic composite sheet. It is comprised of a unique synthetic polymer that when heated in the range of 150-170 degrees Farenhight (70-80 degrees C), it will soften and activate a built in adhesive for molding and forming. A layer of polyester open weave scrim is located on both the top and bottom surface for strength, reinforcement and stability.

You have about 2-3 minutes of work or open time before it cools off and reverts back to its original stiffness.  If you find it is becoming difficult to mold and shape as it cools off, just reheat. Wonderflex can be heated again and again.