P
Protilers
I could never see how these trowels worked as they put no key onto the floor, yes you got the floors flat, but there are no teeth to bite the adhesive into the floor, quality leveling compounds seem to key themselves in.
you should always use the flat side of the trowel to "butter!" the floor, then the tile..........then (with the notched side.. apply adhesive to the floor!) .......thats how they are supposed to work...
(but there are much better methods today!).....
Lee