I wouldn't worry about it being Teflon to be honest. I used some of that box strapping plastic with the moulded in fake webbing effect. Stapled it at either end of the half circle and it works a treat. It is less affected by dirt or contamination with the slightly raised knobbly surface it has and has the added advantage of not only being freely available but free ...
Doesn't seem to suffer from 'stichion' problems either.
Try it while you wait for your teflon to arrive.... then sell the teflon on ...
