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We wish to dress a corner of the wall behind a spiral staircase, but there is 1 cm between the stairs and the wall. What kind of washable liner could we install ???

You are constrained by the lack of space. The difficulty lies in laying this coating. I think that in your case a washable paint would still be the simplest to implement using a gun, after taking care to protect your staircase (a bit like when repainting a car). You can also consider installing a non-woven non-woven, easy to install after gluing the wall.

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