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Old 01-18-2018, 06:02 AM   #1
Big Taco
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Marble re grout question

hey guys, forgive me if this has been addressed already. I have a bathroom floor that has 1" hexagon Carrera marble. It was originally grouted with sanded grout. The contractor sealed the tile and grout while the grout was dirty. It was then gone over with non sanded, which was my mistake. Grouts don't match up. Is there anything I can use to remove the non sanded grout and some of the original grout, so I can re grout without replacing the floor? I've tried grout haze remover, nano scrub, etc. Didn't do anything.

What will happen if I use sulfamic acid? It is polished.

Thanks in advance.
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Old 01-18-2018, 09:43 AM   #2
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Keep any and all acids away from the marble as they will permanently etch the marble making it dull.

The only way to remove the grout is to scrape /grind it from between the tiles.

You'll need something like a carbide dental drill and tons of patience.

I'd start by emptying the cuss jar.

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Old 03-06-2018, 07:34 AM   #3
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Vibrating Dremel type tool is good for removing grout

A multimax with some carbide grout blades is what you want for grout removal
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Old 03-06-2018, 07:36 AM   #4
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rather than removing the grout

How about using Aquamix grout colorant? It's an epoxy based coating that's tougher than the grout it covers. I used it in my shower 17 yrs ago and it's still amazingly new looking - plus it doesn't absorb water, so no mildew issues!
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Old 03-15-2018, 10:57 AM   #5
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I would use a Dremel with a round blade attachment. You just have to be sure you don't score the stone, so you have to keep it straight.
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