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Originally Posted by kerry edwards
It stays pliable in the pail because it can't dry out...same thing in the shower...it never really dries. You need REAL thinset, made with cement. Once cured, it is a rock, not rubber like that will soften when it gets wet. If you plug the drain, and let water sit in the shower pan for a day or two, you will probably be able to scrape them all off that part of the floor, including the mastic (which is what it really is if it was in a pail, regardless of what they say on the label). Reset them in real thinset, and at least the floor will stay intact. The walls are another matter.
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My experience says that he's on the money. I have used the premixed "thinset" and it definitely does not fully harden. Along the edge of the tiles, the mixture remained dry but somewhat pliable. It definitely seemed like the wrong material for a kitchen or a bathroom.
I recently bought a 50 lb. bag of the proper thinset that is sold to contractors. Rather pricey at $30.00 but the stuff dries like a rock. I tiled a bathroom floor with it using the mosaics. I'll give it 10 years and see how it does...........