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Joe The Handyman
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Discussion Starter · #1 ·
I regrouted a shower for a customer yesterday
4 inch white tile on sheetrock with some type of brown thinset. I reattached a few loose tiles so I had a good look at the old adhesive.

Scraped out the old,loose grout & caulk, mixed up some unsanded snow white grout and got to work.
Everything looked great until final cleanup of grout haze.
The new grout stared to turn brown in some spots. Almost like the stain was bleeding through.
I am going back today to see what it looks like now.
Has anyone experienced this before?
 

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hack of all trades
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1,144 Posts
Is there a chance it could be some type of non thinset adhesive? If the tile was glued straight to the drywall, maybe they used a bucket adhesive that's not meant for real tile. I imagine a lot of that vinyl tile mastic would bleed through grout.
 

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Carpe Diem
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Registered
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4,663 Posts
Try some Zep Grout Cleaner. You may get lucky.

Could be sucking the color out of the greenboard ??? Or new mastic??
 

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Contractor of the Month
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26,075 Posts
Was it the setting compound telegraphing through?
 

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Joe The Handyman
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68 Posts
Discussion Starter · #6 ·
Thanks for the suggestions
I do think it’s the brown thin set bleeding through. I was back there a day later and its a few spots at shoulder level where the old grout was gone.
Most likely spot to have been a little wet
I may try the grout colorant if they decide it really bothers them.
The overall appearance is so much better after new grout and caulk that they may live with it
 
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