Baird, Mexiglaze will not allow vapor transmission, de-limitation can occur if moisture is trapped inside the Terra Cotta structure. I see it allot here in the historic part of old town and along the Rio Grande. I don't use Mexiglaze except for exterior applications. I used it once on Sandstone and the home owner had to move out the smell was so bad. The SBS sealer by Aldon is another good product, it has less solids then the Mexiglaze and works well for dense surfaces. I use a small leather hammer to lightly tap on tiled surfaces to check for de-lamination you will hear hallow sound, but it may not be de-lamination in the tile. Normally the change in sound is the result of the tile coming loose from the mortar bed. Aqua Mix has some pretty good topical sealers, the janitorial services here use concrete sealer for interior Terra Cotta.
Joe Walters
Stone & Grout Meister, LLC
Albuquerque, NM
From: BAIRDSTANDISH@comcast.net [mailto:BAIRDSTANDISH@comcast.net]
Sent: Saturday, January 31, 2009 4:08 PM
To: Restoration and Maintenance
Subject: [sccpartners] Oil or water?
Hi,
Here's one I haven't confronted before. A potential client would like
to have his terra cotta floor stripped, cleaned and recoated (the
tiles are dark red and 6 sides- more refined than Mexican tile-and the
sealer has become scratched and worn off in places). But he has
concerns that if I apply a solvent based sealer (I suggested
mexiglaze) to a floor that previously had a water based sealer (or
vice versa), it might delaminate. After stripping and cleaning floors
before with a brush I have never noticed any residual under-the-
surface coatings remaining and, at any rate, never had a problem like
this. I am not even sure how to test for this. But I don't want to buy
a case of each and test it it that way (delamination would probably
occur much later anyway). How would I test? Is this a concern? Also,
can anyone suggest alternatives to mexiglaze? I have been using it
religiously after Brian Yeager suggested it many moons ago, but it
takes 6 days for Aldon to ship it to me.
Thanks
Baird
__________________
From:
Baird Standish
Managing Partner
Facility Specialists Decorative Floor Restoration
1616 Walnut Street
Philadelphia, PA 19103
215-732-7505
www.facspecs.com
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