The array of materials on the market that are suitable for making props and costumes is impressive, and Sintra is just one of the options. The plastic sheets can be heated and shaped, and DeviantArt user Foayasha used it to create a fantastic looking Death Scythe from Soul Eater. She put together a photo showing the progress from step to step and outlined the basics:
You see my progress, starting with just flat sheets of sintra. I used several layers of both 1/4″ and 1/8″ sintra sheets to add depth. Once it was generally assembled I started filling in the gaps you notice along the blade with “bondo” (just body filler). I tried a new one this time, which was somewhat easier to use. I still hated it though…
Anyways, after that was complete on both sides giving the scythe a nice clean look, I primered and sanded, and then painted and sanded. I added the little bits of painted detail, and then created the eyeballs with some heated up sintra I molded over a roundish shape… a wig head.
View the entire tutorial at DeviantArt.