So had a customer come in today with an original oil painting, rather old, on canvas, rolled up. It had been cut off the original stretcher frame, so there is no extra canvas at the edges for stretching on a new frame. The painting now runs right to the edge, and she doesn't want to lose any more of the image by restretching. She wants to frame without glass. It's large enough (about 24x32) that it'll need support. About the only method I can think of is to dry mount it (on Mountcor Canvas?). That way you don't lose any edge detail (except what's under the lip of the frame), and it's well-supported. I explained to the client that we never want to permanently mount original art, but given the circumstances, I couldn't really see another option. She's fine with mounting it. It cost her a few hundred dollars, but she's older and doesn't care about resale value. But are there any options I'm missing here for supporting a canvas, not under glass, that can't be stretched?