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Unread 06-12-2020, 10:06 AM   #1
NJDSG
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First time replacing grout in shower wall + floor joint with silicone caulk

The grout where the shower walls and floor meet was cracking, so I decided to go ahead and replace it with silicone caulk. I've never tried to remove grout before, so that was an adventure in and of itself.

I'm at the stage of cleaning up the tile at either plane and was wondering about the grout haze shown in the photo. Should I try to remove that before applying the silicone? (Um, yes that might have been left by yours truly when he tried to "touch up" the grout previously.)
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Unread 06-12-2020, 10:37 AM   #2
Davy
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Yes, get it clean first but avoid flooding the joint. Sometimes a dry cloth will remove the haze. If you have to wash it, let it dry well before installing the silicone.
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Unread 06-12-2020, 10:59 AM   #3
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Thanks Davy. Ok, I'll clean it up before going further.

So far I've tried an acetone dampened rag with no luck. Is there a product that's effective at removing the haze and is safe for stone tile?
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Unread 06-12-2020, 01:58 PM   #4
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Hi Matt,

Acetone won't do anything to cement. The tile looks like ceramic to me. If it is in fact stone, as long as it's not marble, limestone or slate you can use sufamic acid, which is available at Home Depot and Lowes. You might try white vinegar and a stiff brush before resorting to the acid.

Do not use any acid stronger than sulfamic.
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Unread 06-12-2020, 02:36 PM   #5
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Hi John. Thanks for weighing in on this.

I did some digging around and found the extra tiles left over from when this bathroom was done. Looks like it is in fact marble (according to the box).

Some better shots below. Sound like this changes/limits what I can use to remove the grout haze?
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Unread 06-12-2020, 03:46 PM   #6
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Try a very small area with very fine wet sandpaper and see what that does.
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Unread 06-12-2020, 04:51 PM   #7
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I can do that. How fine do we want to go here? I have 1000, 1500, 2500, and 3000 grit on hand.
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Unread 06-12-2020, 08:39 PM   #8
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1000 should be fine could probably go a little coarser. Like I said just try a small area first.
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Unread 06-13-2020, 06:53 AM   #9
NJDSG
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Ok, wet sanding a small area with 1000, using moderate pressure, removed a little bit of the haze, maybe 10 percent. Worth trying 650?
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Unread 06-13-2020, 12:28 PM   #10
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Moved to 800, and it's very slow going. Of course, it looks good when it's wet and then the white comes back. If this is my only option, I'll keep at it. But if there's anything else I can/should try on marble, let me know.

Thanks again everyone.
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Unread 06-13-2020, 08:21 PM   #11
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The haze after sanding may be due to the sealer being sanded off. Especially if an enhancing sealer was used.

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Unread 06-13-2020, 08:33 PM   #12
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Interesting. I guess I'll keep at it, since it sounds like leaving any of the haze would interfere with the adhesion of the silicone.
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Unread 06-13-2020, 09:52 PM   #13
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Welcome, hatt4556. Please put a first name in a permanent signature line for us to use.

Sanding is unlikely to have any effect on any penetrating sealer or enhancing sealer likely to have been used on a stone tile. Those don't remain on the surface of the tiles.

My opinion; worth price charged.
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