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I have a section on a grout line where there's a white/grey dot. Is this a hole? How do I touch it up? Can I just apply grout sealer?

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  • The white/grey not a hole, but the black dot might be. Can you push a small nail/pin into it? Where is the grout line, a very wet area like a shower floor or someplace else?
    – crip659
    Mar 4, 2022 at 19:18
  • I revised your title. You don't need us to tell you whether that's a hole or not. No one is better suited to that job than you. :)
    – isherwood
    Mar 4, 2022 at 19:20

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That looks like two things to me (neither of which are of concern): A bit of off-color mixture and a tiny air pocket.

Grout sealer doesn't repair grout. It's a very low-viscosity fluid designed to penetrate the grout and make it watertight. It doesn't leave much of a coating, and it doesn't fill voids. Usually. A heavy application, or several, may fill this. It probably won't mask it very well, though.

If that comically small flaw bothers you, get some matching grout and do a repair. Either just rub some over that area, or scrape out a channel and refill.

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