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Unread 10-03-2020, 03:12 PM   #5
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Join Date: Jul 2001
Location: Boerne, Texas
Posts: 91,805
OK, I changed your link to reflect the black color.

I think your problem might be permenant. That website indicates the following under Specifications, Honed Surface, just below where it says it's a Glazed Porcelain Stoneware:

Originally Posted by Tile.Expert website
This finish, also known as satin, is achieved by treating the tile surface with honing pads, which are less vigorous than those used for polishing, or by application to the tile surface of transparent mineral crystals, which have different melting temperature. The resulting surface is somewhat between matt and polished (incredibly smooth, no shine).
While I'm not at all familiar with that wording relative to a glazed porcelain tile, I'm thinking that you've removed the glaze by more aggressively "honing" the already honed surface. That's just a guess, mind you, but I'm also guessing you can't fix the problem short of replacing the affected tiles. I could not find any information on that site indicating whether the tiles might meet the pertinent ANSI Standard (A137.1) for ceramic tiles (nor any European equivalent), so we don't really have any way to determine the tested durability of the glazed surface. Perhaps the standard in in there somewhere (they do indicate a Shade Variation number) and perhaps someone else can find it.

Could you also provide a link (which you can now do) to the abrasive brushes you used. I'm not familiar with those, either.

As for the grout, it should have been mixed to a rather stiff consistency and forced into the joints. I've never had a Polyblend grout get out of hand, but I'm also not familiar with the "Plus" version of that product. Indeed, never heard of it before today.

That said, leaving the grout to cure overnight without having finished the joints or cleaned the tile surface was a fatal mistake. Can't do that with cementitious products, 'specially when you've created a problem. Portland cement is completely unforgiving of time lapse; it starts to cure the moment it senses the presence of moisture and never keeps on so long as any moisture at all can be found. Once you place a Portland cement product, you hafta finish it all in one go as our Brit friends might say.

Tell us about those brushes.

My opinion; worth price charged.

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