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I've had that happen and I've had to restretch it. I keep the corners attached to the stretcher bar so it doesn't get out of alignment and then I remove and re-staple it section by section in the same order as if I was stretching a new canvas. Pull as tightly as you can.
You can avoid the problem somewhat by storing the linen in a warm dry place and by only stretching it on a warm, dry day (not always an easy thing here in Seattle!)
I haven't had much problem with this since I bought some serious($100 !!) molybdenum canvas stretching pliers. It seems that the first time I stretch it is sufficient, most of the time.
I personally wouldn't spray anything on the back of it.
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