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The cardboard is to cover the entire back. This is to reduce the variation in humidity to the exposed back of the canvas.It could tighten up again but I would go ahead and re-stretch the canvas in the areas that have loosened. I believe this will solve your problem, it certainly has for me and for several of my artist friends who have experienced the same problem. I personally don't like the idea of misting the back of the canvas.
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Threaded Mode
