Did i say Plumbers Putty? I meant Plumber two part Epoxy. At least i think that's what it's called. I used it a lot in some of my puppet making projects in college... it's a two part grey cylinder as fat as a cigar that's one part in the middle with the second part surrounding it. All you do is break off a chunk and kneed it a bit, and it's supposedly as hard a steel after full curing. It really is amazin' stuff. I think i still have half a tube in my closet somewhere...

[edit] yeah, it's called plumbers epoxy putty... here's something similar:
http://doityourself.com/store/6766356.htm