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Hi everyone,
Here are my two cents worth on the stretching after-the-fact issue, if I may...
Sharon,
If the painting is new and if it has been painted on pre-ground canvas (both of which are my assumptions regarding Carol's painting) then I think the after-the-fact stretching shouldn't cause any problems, so long as it was evenly done and didn't distort the image. As you know, paintings are removed from stretchers and then rolled for shipping and then re-stretched all the time. Of course, the initial thing was already stretched. But, really the same would apply to pre-primed canvas which is factory-stretched. The key to doing it, as I said, would be to take considerable care in uniformly stretching and not to over-stretch. Young oil paint films and grounds are quite flexible. Perhaps you've had a bad experience with this, yourself, but I have never seen fissures develop in the paint or ground layer from stretching an after-the-fact oil painting done on pre-primed canvas, and I've seen a fair number of such paintings.
Linda
I'd say that gluing after varnishing might present at least one problem; as you normally have to apply pressure to the surface to let the glue do its work, that could scar or mar the varnish. That's about it, though. What do you think? Also for anyone who uses a lot of heavy impasto and surface effects in their paint, gluing after-the-fact is not a good idea because that same surface pressure may flatten out their sought-after paint effects.
By the way, I use those tacks, too. I've even applied them cosmetically to a panel painting just for their nice look!
Best.
Juan
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