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Old 03-05-2011, 08:30 AM   #1
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Granite back splash


A granite back splash installed professionally on an outside wall in the kitchen. It looks like adhesive round marks bled through the granite. This developed a few hours after installation. Is this normal and will it fade.

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Old 03-05-2011, 09:45 AM   #2
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Granite back splash


Yes,that is very likely a moisture stain--it will fade and go away in a week or so----that sounds like a granite that will need to be sealed after the moisture stabilizes.

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Old 03-05-2011, 09:50 AM   #3
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I love it when that happens! Scares the hell out of people after spending all that money. Had a few late-night phone calls myself over the years.

Depending on what type of adhesive was used-it will likely go away over a short time.
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Old 03-05-2011, 03:28 PM   #4
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Granite back splash


Thank you so very much guys! Now I will be able to sleep tonight....I was sweating this one and of course the granite yard was closed today. Thanks again.....
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Old 03-05-2011, 04:14 PM   #5
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Granite back splash


Under certain atmospheric conditions I have seen the stone take three to four weeks to clear up. Whatever you do, don't try to seal the stone until the spots have been totally gone for a week or two. Once the spots are no longer visible on the surface there will still be moisture in the stone on the backside for a while.
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Old 03-05-2011, 07:21 PM   #6
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Granite back splash


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Originally Posted by Bud Cline View Post
I love it when that happens! Scares the hell out of people after spending all that money. Had a few late-night phone calls myself over the years.

Depending on what type of adhesive was used-it will likely go away over a short time.
Bud, What causes this? Is it surface residue or bleed through from the back of the granite?
What adhesive is used? Thinset?
I've never experienced this situation.
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Old 03-05-2011, 11:23 PM   #7
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Granite back splash


Those type stones are basically soft as far as rocks go. Yow I know, go figure. What I hope they are seeing is nothing more than moisture from the thinset. Moisture will always seek to rise and seek to evaporate and in this case it is simply moisture that is leeching towards the face of the stone in an effort to evaporate.


I said "I hope" because some mastic's that should never be used on natural stones contain light oils. Oils will also leech into the stone, but they of course will stain for a time. That may not be the end of the world however. Since the government removed the V.O.C.'s from that type of product years ago some of them still do contain mineral spirits. Eventually the mineral spirits (if that's what it is) will also totally evaporate but that may take months.

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