Some good thorough advice, Thanks Steve. But I think I missed the first sentence or two of your message-seems to be cut off. Meanwhile, after bonding the tiles that are under the toliet, (I tried to level the tiles as best as possible.) I then set the toliet down (dry run--no wax seal yet)and sat on it to be sure things were settled. Nothing has cracked.I'm letting the tile bond dry with the toliet sitting on top. Sound reasonable? Carl.