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Hi Mark,
I use the same type of canvas you do and restretching after the painting was done has always worked for me, if there were ripples from the initial stretching. Garth's technique (of pulling and tacking the corners very tightly as soon as you've put one staple or tack in the middle of each side) has made a big difference. One of the most well known artists in Seattle has suggested canvas-tightening spray that she buys from online art suppliers that may help. I don't know the particular brand she uses.
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