In order to do this amazing lab you must purchase the two parts to make Flexible Urethane Foam. This is the lab sheets and directions to guide student through this. I did this as a Halloween experiment and students absolutely LOVE it! I had students use sharpies, and add eyes, feathers, etc...in the 'drying process' which is fast. Try it before you do it with students. They competed to see who had the scariest, cutest, etc... monster.