Black tar like substance

boazcan

Member
Joined
Jan 11, 2007
Messages
1,522
Name
Bryan C
New one on me.

We do sealing of grout on new houses. We did over 1400 sq ft in this house yesterday and 3 places there was a black tar like substance that oozed out of some grout.

I'm assuming our solvent based sealer penetrated a small opening where the grout should meet the tile. As it dried it brought it up.

What the heck is it? Some sort of float membrane. We have settling issues here so it may help in cracked tile and grout. Black thin set? Never seen it before and we do a bunch of new grout seals. But not in this new neighborhood yet.

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Last edited:

dealtimeman

Everyday is Saturday.
Joined
Sep 20, 2008
Messages
10,878
Name
Michael
Never seen that before. Keep us poser in what works to remove or the actual source.
 

Bee Busy

Member
Joined
Aug 19, 2010
Messages
799
Name
Bee Busy
I've used a diamond tipped grout getter with some colorseal for that before
 
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