wine~o wrote:I'm not at all surprised they fell off.. they should be laid on a full bed of addy, not dabbed on..
I've read lots of conflicting views on this, and even visiting different retailers around my way got a different answer every time
When I pulled each tile off, I had to knock off all the adhesive on the back of every single one, and believe me, it was stuck like sh*t to a blanket. So I wonder how well even a bed of adhesive would have stuck to the 'Paint' on the walls?
After removing the tiles, and removing all the lumps of adhesive, scoring all the walls etc, I did re fit them all using dot and dab again. They seem rock solid now, they even sound very solid when giving them a 'Knock'. Unlike previously when they sounded 'Iffy' and proceeded to fall off the wall.
Rorschach wrote:I hope you didn't pay him!
Unfortunately I'd already paid after seeing the job done, and when I went down a couple of days later...Disaster.

Queried him, he seemed shocked saying he's never had it happen before. I told him about the paint on the walls, but he was convinced there must have been something wrong with the adhesive...
Offered to come back and 'Have a look' but I've had enough of idiots (Had a few on my house renovation) and told him I'd do it myself, so I did, literally straight away, no messing. Even the spacing is better now too.