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Unread 03-16-2018, 07:45 PM   #1
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Join Date: Oct 2006
Location: Maple Valley, Washington
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Mapei Unsanded Grout and Mapei Maximzer Turned Yellow

Anyone have any experience with Mapei Unsanded White Grout and their Maximzer turning yellow?

I installed around 60 feet of Glass Tile and the Grout joints are turning yellow. It started faintly at first but it's becoming very dark.



I used Custom's Glass Setting Mortar to set the tile.


From what I've read it's usually Yellows from using the wrong water type but in my scenario I used the grout maximizer in lieu of water.

Any idea if grout paints or dyes might work to dye it back? It's on accent wall in a bathroom with zero water exposure.

Any insight is appreciated.

Name: Joe
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Unread 03-17-2018, 05:47 AM   #2
Karls tile Inc
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Join Date: Feb 2016
Location: Boca Raton Florida
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Do a sample board with no maximizer and then see what happens.

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Unread 03-19-2018, 02:49 PM   #3
MAPEI - Technical Service
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Location: North Texas
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Joe, I have to say that we don't have a lot of 'yellowing' complaints with Grout Maximizer. As you state, it's supposed to minimize issues, not cause them. We do have a product called Grout Refresh that will restore the color. Sorry for your issue.

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