Did you seal that stone before or after grouting?
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-----Original Message-----
From: "Mike Marsoun" <nulifesc@bigpond.com>
Date: Sat, 3 Apr 2010 21:56:34
To: Restoration and Maintenance<sccpartners@stoneandtilepros.com>
Subject: [sccpartners] black stains on Sandstone

This is strange. For a friend who is a supplier. There is 3 photo's that say
grouted section.  This black started not long after grouting, mainly around
were they cleaned off the grout.  It seemed like the grout contaminated the
stone.   So 80% of the wall they did not grout and
was looking good until a couple of weeks ago, and now that is starting to go
too.
Mike Marsoun
Nu Life Stone Care

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