So spread adhesive with 10mm rounded trowel onto the floor then spread a thin layer all over the back of the tiles with a straight edge trowel rather than combing it with notched trowel?
Either really, I just use the same trowel. Basically for larger format tiles, the point of back buttering is to ensure complete bedding/support of the tiles, in all honesty you should get that anyway with a 10mm notch as you press the tile in.
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