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Unread 06-07-2016, 07:28 PM   #4
Houston Remodeler
Pondering retirement daily

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Join Date: Oct 2009
Location: Houston Texas
Posts: 28,207
That's good news.

The charcoal grout typically does to porous tile what happened to you. Personally I would have tried my best to talk you out of using a cement based grout if you wanted black grout and then tried to talk you out of black grout. Generally its a no win situation.

To get the precise advice you need, contact tech support at Custom Blend (they are in CA) They will let you know if anything can be done.
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