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Unread 03-20-2019, 10:40 PM   #1
skiroc
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sealing stone before grouting

I am barely a DIY'er and managed to install a nice looking backsplash using 2 x 6 natural stone with another DIY'er friend.

I understand that I need to seal the stone before grouting, but my friend tells me I should not get any sealer on the sides of the stone, that the grout won't stick if it has sealer. However, videos I watch of the sealing process shows people spraying or wiping it on and they don't seem concerned about getting sealer on the sides of the tile.

Since the stone has pits and other natural features, spraying the sealer on would be much easier as long as it's ok that sealer gets on the sides.

What's the best practice?
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Unread 03-20-2019, 11:07 PM   #2
Tool Guy - Kg
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Your friend is steering you right. It’s not a good idea to get excess seal on the sides of the tiles. Dampen a clean, while cloth with sealer and neatly fold it flat. Keep the cloth flat and run it over all the tiles. Fastest way I know.

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Unread 03-20-2019, 11:27 PM   #3
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got it, thanks. I assume using a small brush to dab in the pits would help?
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Unread 03-21-2019, 06:54 AM   #4
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You'll never be able to keep grout from sticking in the unfilled portions of the stone, and I'm not sure you'd want to. If you want to keep grout out of the pits, you'll have to use a grout bag, or a refillable caulking tube. Is this a true unfilled stone, or are the "pits" just shallow impressions. Can you post a picture?

I personally never pre-seal natural stone before grouting.
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Unread 03-21-2019, 11:15 AM   #5
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here's a few shots
Attached Images
  
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Unread 03-21-2019, 02:59 PM   #6
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Okay, standard unfilled travertine. Like I said, I don't think you're going to keep the grout out of those unfilled areas by sealing them. If you want to keep them unfilled, you'll have to use a grout bag, or refillable caulking tube.
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Unread 03-21-2019, 04:26 PM   #7
skiroc
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got it, thanks Greg
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Unread 03-22-2019, 12:34 AM   #8
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Before sealing, I would clean the face of the tile with a damp sponge, and allow it dry completely. Those travertine can have a lot of dust on them, which could affect the sealer.
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Unread 03-23-2019, 11:53 AM   #9
Tool Guy - Kg
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That's really good advice to clean, clean, clean the tiles free of dust before sealing.

But there's no possible way I'd leave those holes unfilled if this is a backsplash. Either fill the holes with grout or they will slowly be contaminated with nasties that are impossible to clean.

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Unread 04-12-2019, 01:06 PM   #10
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Re: Sealing Stone Before Grouting

DIY friends always know best haha. I know it seems like sealing it after grout would mean the grout is "sealed" but not the case here, I would do it very lightly on face of the tiles avoiding excess sealant on the edges
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