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Unread 05-13-2010, 04:31 PM   #1
cled
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White marble turning grey/dark color

I just installed a few marble tiles for a tub surround and they started to turn grey in some spots. I used white mortar(MegaLite) from Home Depot and the tiles were on Durock. I have stopped the job and removed the tiles. Can anyone help? Do I have to seal the back of the marble tiles (which come in sheets)? Thanks
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Unread 05-13-2010, 04:37 PM   #2
Brian in San Diego
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Chris,

Discoloration of stone products during installation is normal. Once the thinset cures the color should return to normal. It may take many days. You could try a test board and see what happens. You DO NOT want to seal the backs of the tile.

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Unread 05-13-2010, 04:48 PM   #3
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Yep....What Brian said. The moisture from the thinset WILL tend to darken the marble for a while. Once it totally dries....might take a week or more, it'll come back to the original colour.
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Unread 05-13-2010, 08:22 PM   #4
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Thanks for the advice. I'll start up again tommorrow and be patient.
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Unread 05-13-2010, 10:35 PM   #5
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also use white thinset
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Unread 05-13-2010, 11:55 PM   #6
Brian in San Diego
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Quote:
Originally Posted by MM
also use white thinset
He did.
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Unread 05-14-2010, 03:18 AM   #7
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When you go to grout, it will darken the marble as well - since the grout has water. You'll have to wait for that to dry out too. Then seal
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