Garth,
I'm resurrecting your post to thank you for it. I've had such trouble in the past with wrinkles in the canvas. I've used your method, and it works very well.
In my case, I think part of my problem was that I was pulling too tight from the get-go. This time I stretched the canvas with a light pull, then after it was in place and wrinkle-free, went back, took the staples out in small sections at a time and re-stretched as I went, working from side to side as originally. I was able to pull the canvas even tighter this way, with not a wrinkle to be seen. It seemed to me that the (linen double-primed) canvas relaxed a bit after sitting for a while in-between stretching sessions.
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