I'm facing the ends of some 303 SS TGP and wandering if having jaws
made from polturethane would grip the stock well enough.

Anyone try this??

I cover the jaws with electrical tape now so they don't stratch the
stock.

I did another job where I had to turn and thread the ends 1/2-13 with
a geometric type head, think they'd work for that? The tape trick
did.

I've seen Poly used for press brake dies, so.....