For this project the microwave experiment worked out just fine. I think that the small amount of clay used in this project was a factor in the success. I am not sure if a larger amount of clay will harden well in the microwave. I might give it a try and see what happens unless my wife catches me using her microwave. :)
DVD and the 2013 update DVD at this link. DVD #1 is $20 and contains over 1,100 patterns. The 2013 update DVD is $7.50 and has another 178 patterns.