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Warm is good. As paint dries it becomes more brittle, that includes oil primers; warming will encourage plasticity. Encouraging a bit of "shrink" by moistening is also OK . Another "trick" that may prove useful is to put alum in the water, 1 tbsp in a pint.
Archivally speaking, you're at the "mercy" of the materials and methods the mfgr. employed in making the canvas. None of these coping techniques will either harm a painting support or affect your application of paint on it.
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