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Old 12-15-2008, 07:27 PM   #2
Brian in San Diego
AC Specialist -- Schluterville Graduate
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Join Date: Oct 2005
Location: La Quinta, CA and Usk, WA
Posts: 10,767

Because of the additives added to the mortar that give it better adhesion qualities.

If that doesn't work, I'll always think it should have.
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