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The green color of the gimwarton does not affect drywall in any way. This is just a way to distinguish moisture -resistant panels from ordinary.

The wax layer increases the thickness of the panel. The additional thickness of the moisture -resistant drywall compensates for the loss of the strength of such a panel when filling with moisture. The fact is that when a moisture -resistant drywall gets wet, it becomes weaker than a standard drywall.