If everyone who responded would actually go watch the demo for the sander the OP is talking about you would understand why heat is NOT an issue for this machine and why PVC does in fact work for it. This is nothing like your regular drum sanders. It really doesnt do what a standard drum sander does, nor the way a standard drum sander does it. That being said I do agree with the folks who suggested searching for a used or reasonable priced drum sander for the OP's intended use.
If at first you don't succeed, look in the trash for the instructions.