This technique works for linen canvases and cotton canvases. Unfortunately, if your canvas is made of synthetic fabric, there isn’t much you can do, at least as far as I know.
However, if the issue comes from a poorly applied or low-quality primer, the problem will likely come back.
More difficult on formats above 50 x 50 cm
Or a sponge
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The cloth must be damp, not soaked.
You only need to moisten it. No need to flood the canvas.
Do not wet the painted side.
Move it back and forth and avoid staying too long in one spot to prevent burning the canvas.
If you feel the canvas is still not tight enough, you can repeat the process.
