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Unread 12-31-2020, 11:59 AM   #2
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Join Date: Jul 2005
Location: Fairfax, Va
Posts: 4,317
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Welcome back, Allen,

Not quite sure I can tell what I'm looking at, is there already some mortar on the tray? If so, I'd use a rub stone to remove some of it, and then add some mortar to fill in. You'll have to let the fill in mortar dry first before laying the membrane.
If I recall correctly my memory is excellent, but my ability to access it is intermittent.
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