I am looking for a sturdy, flexible, molded plastic corner bead. I am hanging drapries in a theatre room on a curved wall. I have found a couple but they are not sturdy enough. Does anyone have any idea where I can find such a thing?
Flexible corner bead for DIYers is normally made from plastic, and works fine. You can get it at basically any box store.
I don't know why anyone would need "sturdy" corner bead...
On commercial jobs, drywallers will often create corner bead by cutting wedges out of the flanges of metal corner bead. That allows it to be bent around an outside curve. Cutting slits in the corner bead's flanges would allow it to be bent around and inside curve.