After sealing a stone tile surface outdoors, these white cloudy spots appeared within a day or two. They appear more frequently near the grout than the tile, but not exclusively. What caused this, and what can I do to clean it up, if anything?

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1 Answer 1


From my experience, it is excess moisture. The one spot looks like water sat on the sealer before it cured. The remedy is add a bit more sealer to the area, try just enough to dampen the area first on a clean cloth. Make sure it is dry, and stays dry until it cures.

  • You're ruling out birds? :-)
    – fixer1234
    May 24, 2017 at 18:11
  • 1
    No lumps...or at least a dark speck.
    – Jack
    May 25, 2017 at 2:20
  • Definitely not birds. Not obvious from this one photo, I agree, but looking at some of the other spots it's quite obvious.
    – Gregable
    May 25, 2017 at 21:18
  • I'll give this a try.
    – Gregable
    May 25, 2017 at 21:18
  • Seems to help significantly. Not perfect but much better. Thanks
    – Gregable
    Jun 10, 2017 at 15:52

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