Watched a finisher crease a whole driveway with a plastic trowel once and he just shrugged and said it was cheaper than a chiropractor. Honestly the joke is on me because I still lug around my steel ones like they owe me money. Now I hear Tulsa guy and I'm wondering if I've been doing it the hard way this whole time for no good reason. But plastic melting on a 90 degree pour sounds like a whole different kind of problem. Guess the real test is whether it's still flat when the sun goes down.