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Old 12-15-2017, 07:14 PM   #1
edbianc
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Silicone stain on granite

About 10 years ago we had granite counter tops and 4" high granite back splash installed in our home. I decided to remove the granite back splash and will be installing a full length back splash of a mosaic. My problem is when the granite back splash was removed a stain line exists where the sealant used in the joint between the back splash and the counter top. Photos attached.
I have tried poultices of baking soda and acetone, baking soda and dish washing soap, and rubbing alcohol. Nothing seems to lessen this stain. Can anyone offer a solution? Thanks!
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Old 12-16-2017, 10:35 AM   #2
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Hi Ed, Welcome aboard.

Are you sure all the silicone has been removed? You can't get at the stain otherwise.
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Old 12-16-2017, 02:13 PM   #3
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Hi John, thanks for responding. I believe I have gotten all the silicon off that will come off with a straight razor and a scraper. (Is there something else I should try?) It does not feel like there is any silicon left nor can I see any residue.
I just put on a poultice of flour and hydrogen peroxide (30%) and will leave it on overnight to see if that will do anything.
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Old 12-17-2017, 11:17 AM   #4
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Well the peroxide mix did not seem to do anything to my stain. Does anyone have a suggestion?
I will reapply this mix again in the hope that multiple applications might help.
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Old 12-17-2017, 11:59 AM   #5
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There are products marketed as "silicone remover" that would, I presume, chemically attack the silicone. Not having any experience with them, I would say there may be a risk that the silicone remover itself might leave a stain, or possibly be absorbed by the granite and interfere with future use of silicone or other caulk. You could test one of them in a small area, maybe taping off behind the silicone stain where you will be caulking in the future at the tile/counter top interface.

Or perhaps you could find a local granite fabricator that has some experience with this issue and would know how to handle it?

Cheers, Wayne
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Old 12-17-2017, 04:40 PM   #6
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The only product that comes to mind is Dicone9 from a company called Prosoco. But I've not dealt with a sub-surface stain in granite like that. I'd call their customer service. (800) 255-4255

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Old 12-17-2017, 08:52 PM   #7
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I have heard of Divine, but it is very expensive (like $100 gal) and I don't know anyone who has used it. However I will call them to set what they say.

Thanks.
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Old 12-17-2017, 10:29 PM   #8
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can't you add layer of drywall?
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Old 12-17-2017, 10:55 PM   #9
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If it won’t come off might consider some kind of enhancer to make the balance of the granite match the silicone appearance.
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Old 12-18-2017, 07:04 AM   #10
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- lati_cz, The original granite back splash was 1.25" thick, so adding drywall would require expanding the wall at least 1.5", which is a lot. But it was a good out of the box suggestion!

-Topspin, I had thought about this solution also and may be the solution of last resort. What kind of "enhancer" would one use to mute the existing stripe effect?
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Old 12-18-2017, 09:47 AM   #11
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Another option would be to use a cove base tile, instead of padding out the whole wall.

A google or amazon search for "silicone remover" comes up with a number of products besides the Dicone9. I have no idea if they work.

Cheers, Wayne
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Old 12-18-2017, 08:46 PM   #12
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I am getting a free sample of Dicone NC9 to try but it will have to wait until after the holidays.
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Old 12-18-2017, 10:33 PM   #13
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Is it coming from Prosoco or a local dealer?

Always remember the golden rule when it comes to restoration stuff. TEST in a hidden or inconspicuous spot before committing to the whole thing.

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Old 12-19-2017, 07:20 AM   #14
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I had the local Sherwin Williams store order it from Prosoco, since they carry their products.
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Old 12-19-2017, 07:36 PM   #15
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Cool. Prosoco is one of those companies that I really like because they make really good products. Glad SW is getting you a sample.

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