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Unread 07-21-2013, 10:43 AM   #1
Bubba1855
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white specs in dark grout

Contractor just finished putting down porcelain tile on outdoor patio. Used CBP, sanded grout/polyblend. It's a dark color...color name is 'new taupe'.
The tile is a slate color, we wanted a darker grout. Tile went down fine, the grouting went fine...just the color we wanted. Contractor recommended 'sealing' the grout. He did our baths last year (grout and tile are 'light' colors). I did the sealing with CBP Choice Gold...no problems. Looks fine.
However, when I applied the Choice Gold we ended up with the infamous 'white' haze. Called CBP and they said 'vinegar' and/or their 'Nano Scrub' product. I went straight to their 'Nano' product. Followed the directions to a 'T'...It appears that the white haze caused by excess sealer is gone...but all of the sealed grout has white specs in it...making the grout color look almost white. No amount of scrubbing will get it off. I used, by hand, one of those carbide grout removal blades in a small area to see how far down it goes...It looks like it goes as deep as the 'Choice Gold' penetrated.
If we have to remove the grout and start over, so be it. If I remove the grout and re-grout I sure don't want to use 'Choice Gold' again...What should I use...and yes whatever you recommend I'll only put down on a small sample before proceeding...
Thanks in advance for your comments.
Bill
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Unread 07-21-2013, 11:55 AM   #2
Cain
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I am going to guess that the sealer is not the culprit here.
Polyblend is a low end cement based grout. In an exterior application moisture in the air can cause some shading issues.
I would recommend an epoxy or urethane grout and then you wont have to seal.

Sealers choice is a good sealer, but outside I would use dry treat
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Unread 07-21-2013, 12:19 PM   #3
Ken
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I would have to disagree with Cain's suggestion of using an epoxy grout on slate. As a rule of thumb, I stay away from epoxy grout on a natural stone. You're asking for problems with the results of the product, in my opinion. I know that a lot of manufactures say their epoxy is safe for stone material, but I stay away from epoxy on stone..

For your situation, I would recommend that you remove all of the grout and use a highly pigmented cementitious grout like LATICRETE PermaColor or TEC PowerGrout.
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Unread 07-21-2013, 12:31 PM   #4
Bubba1855
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Just to clear up something that 'Ken' said. The tile is not slate, it's porcelain tile, a slate color...
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Unread 07-21-2013, 12:33 PM   #5
Ken
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My bad.. I did read that completely wrong.

Now my whole opinion changes... Rip out the grout and use an epoxy grout.
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Unread 07-21-2013, 12:40 PM   #6
Cain
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So you do agree with me huh Ken?
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Unread 07-21-2013, 12:42 PM   #7
Ken
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Yeah.. For some reason I totally thought it was Slate.. I'm sorry Cain. :\
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Unread 07-21-2013, 02:02 PM   #8
Davestone
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I wouldn't do either one,sorry.
I would use a color sealant so you don't have to remove the grout at all.I would first clean with sulfamic acid crystals,and a grout brush.This may just remove a lot of the white specs of sealer and solve your problem.At least it will open the pores of the grout so the colorant will adhere well.
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Unread 07-22-2013, 01:30 AM   #9
doitright
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Hi Bill, Welcome!

To me it sounds like you may still have some residue from the Nano Scrub, not a sealer issue. If that's the case, you may just need to pressure wash your grout. Since it's fresh grout, I would keep the pressure down as not to blow out your grout.

If that doesn't work, I'm with Dave on using the grout colorant.
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