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Unread 12-17-2007, 12:10 PM   #2
KenH83
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Join Date: Oct 2007
Posts: 247
This is a problem and the CBU needs to be 100% clean.

Run a vacuum over the entire surface. One done with that take a damp sponge and wipe down all the CBU (rinse sponge frequently), spread the thin-set and lay the tile.

Ken
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