Dear Amy:
“
I have installed honed Thassos mosaic tiles in my bathroom and have sealed them with 3 coats
”
Only 3 coats?... I would have sealed them with at least 127 coats!!
Let me guess: since you're talking about coats, you didn't remove the residue of the sealer off of the surface of the stone after you (pretended to) seal it, did you?
That's what I thought! Why bother reading the back label in a bottle, right?!...
Your stone is not absorbing any grout! The problem is that the grout is sticking to the impregnator (a.k.a. sealer) that you did not remove and that had no business being there to begin with.
What to do?
You? Not much, I'm afraid.
Only a professional stone restoration contractor could solve the problem by professionally re-honing your entire mosaic with the right equipment and a good-quality stone honing powder.
May I ask you now to please read and e-sign our Statement of Purpose at:
http://www.marblecleaning.org/purpose.htm?
Ciao and good luck,
Mauri
Article ID: 691
Created On: Fri, Oct 26, 2007 at 11:47 AM
Last Updated On: Fri, Oct 26, 2007 at 12:00 AM
Authored by: Maurizio Bertoli [mail@mbstone.com]
Online URL: https://marblecleaning.org/knowledgebase/article.php?id=691