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As opposed to a glue or a mastic which often (not all!) "set" by drying, mortar sets by a chemical reaction caused by the molecules incorporating the water into their crystaline structure. Once you add the water, like epoxy, you can't go back, it does it thing.
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Jim DeBruycker
Not a pro, multiple Schluter Workshops (Schluterville and 2013 and 2014 at Schluter Headquarters), Mapei Training 2014, Laticrete Workshop 2014, Custom Building Products Workshop 2015, and Longtime Forum Participant.
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Senior Contributor
