Most of the sealers get absorbed...try just putting some water on the grout in an area and see if it's absorbed. If it beads up, probably won't work.
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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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