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Unread 10-23-2021, 08:57 AM   #6
cx
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Join Date: Jul 2001
Location: Boerne, Texas
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Welcome, Mark.

I would not recommend the use of that particular mortar in your application at all. A good quality modified thinset mortar (ANSI A118.4) might work OK, but I agree with the guys above; replace the drywall for best results.

My opinion; worth price charged.
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