Here's the reply I got over on the John Bridge tile board after I was asked whether I mixed my own thinset or bought it in a pail:

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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Jim DeBruycker
Longtime lurker, avid DIY'er
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