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Hi Lisa,
I just happened on this thread and realize that my response is coming about a year late.
I had the same unfortunate experience a few months ago when I noticed that the canvas on a commissioned portrait was sagging. I was to deliver the painting two days later. Mine was painted on a pre- stretched canvas, 20 x 24. I found a lot of great input but none that worked for my timeframe, so in a panic I decided to try the quickest fix that I found. I have to tell you that I was terrified at the thought of doing this and I'm sure that it is not the best or safest method...but it honestly worked and the canvas remained tight. The instruction that I found online said to heat a pan of water to boiling, pour it into a bowl and using a clean, natural sponge, quickly and 'lightly' wet the back of the canvas...and immediately dry it with a blow dryer. It was an instant fix...not one that I'm proud of, but will probably do again as panic seems to frequent my studio :-)
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