FT Pro, Mem SOG,'08 Cert Excellence PSA, '02 Schroeder Portrait Award Copley Soc, '99 1st Place PSA, '98 Sp Recognition Washington Soc Portrait Artists, '97 1st Prize ASOPA, '97 Best Prtfolio ASOPA
Joined: Jun 2001
Location: Peterborough, NH
Posts: 1,114
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I got into a lot of trouble once when I took a canvas completely off its stretchers...it wouldn't go back on and I had to repaint the darn thing!
Instead, on the back, try tapping in the wooden corner canvas pegs that (hopefully) came with your stretchers (or prestretched canvas). If you don't have these, any art store that sells stretchers will probably give you some.
If you're dealing with linen canvas, alas, it will always bag and sag more than cotton canvas. Changes in temperature and humidity will affect paintings in this manner...that is why you see climate control devices in most museums.
If you tighten the painting with pegs in the back, I don't see that there is much else you can do...your client might just have to live with it until the weather changes. Good luck!
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