I can beat that mate, very successful firm round here (I would love to give their name on here but cant ) will use nothing else but tub, they refuse to even use powder on timber floors. Needless to say they get a lot of failures.
I did a bathroom refurb in an old hotel converted into apartments. It was only 3x2m in size and if I was at one end of the room and the plumber walked in, I could feel myself being raised up there was so much deflection in the floor. Again the developers had used tubbed addy for the floor and the tiles were coming up very quickly. Luckily the customer wanted it all out and replaced. Nice job.
I think it's wonderful stuff!
You open the lid and out wafts that clean scented aroma of creamy paste just waiting to be spread like butter onto a perfectly flat plastered surface.
You gently push the tiles into its moist surface, gently twisting as you go, and one after another a tile is held in position waiting for a cursory wipe with a damp sponge.
What could be more perfect.