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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.

For when DIY isn't such a good idea...
Houston TX area Kitchen & Bath Remodeling
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