O
On one
There's a surprising amount of adhesive used when you back butter a tile or put another way, a surprising amount of voids if you don't back butter
I'm not fussed with the tiger trowels, they state you don't need to back butter with them but nothing will beat the bond strength of back buttering or back skimming.When a little more bed is required, I will comb the floor and the back of the tile. I've been doing just that today, with the tiger trowel.
I've had 2 hanging up in the back of the van since the day they were brought in stock at CTDThey give really good coverage, try one. I'm not slating back buttering at all.