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They're right
I don't know much about portrait painting right now, but I do know about framing as I'm a professional picture framer myself. Mary and Micheal are both right in suggesting offsets. They're acid free, they don't introduce any adhesives or damage the stretcher bars or canvas, and the offsets you get from a frame supplier should be rust resisitant. A couple of things I'd like to add though is the frame should be lined with an aluminum tape that is applied to the rabbet of the frame to help seal the frame's acid from migrating to the stretched canvas. Finally an acid free paper dust cover should be applied with an opening cut into the paper to allow the canvas to breathe.
I know this sounds involved, but if your framing portraits, i.e. heirlooms, it's our responsibilty to do what we can to preserve it for them.
Hope this helps,
Ramon Deslauriers
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