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Can I stretch a slack canvas using water?

Avoid doing this at all costs: it is bad for the painting. When a canvas gets slack, you can easily fix it by adjusting the wedges in the corners. If this does not work, you can always consider removing the canvas and stretching it again following the rules of the art. Do not use water because water will only temporarily tighten the canvas, it will slacken again once it is dry.

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