being a marble installer many moons, before adding restoration to our business,it would be my guess it was the thinset used in the bed mortor, some thinsets especially some of the mapai brand and especially a local brand in north florida "Tec" mortors are so friggin alkali that they eat your hands up and we have had this same thing happen, where it set on the tile a couple minutes before wiping,so we learned our lesson the hard way, doing a free restoration on a new install,but it was near perfect when we finished, and the costomer was thrilled. "blessings" Scott Wilson Stoneworks IncIn a message dated 12/16/2009 12:22:01 P.M. Eastern Standard Time, stephen@newlifemarblerestoration.com writes:Greetings all,I don't know why but I can't send out photos to the group. Text seams to work but delivery fails when I attach a pic. The limestone has an etch like spots everywhere the thinset contacted the stone and Im wondering what may have caused this. I wish you could see it. Its on every tile, new homes (24 of them) installed by a reputable co. But I don't think the back butterd. Thanks
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