What is the correct adhesive for a 600x300 ceramic tile. It's for a bathroom wall. I would have thought that a tub of White star would be good enough, but I just got told by a Topps lad that it has to be powdered adhesive. I asked why and he said that a customer tiled a kitchen in the 600x300 tile and he used tubbed adhesive. some of he tiles fell off the wall a week later, they had wet addy in the middle of them. The Topps store asked head office and head office said that powdered addy should have been used. Head office added that any tile over 300x300 should not be applied with tubbed adhesive. Surely this is not correct? Cheers Sean