Square leaves more than U which leaves more than V but they all smoosh flat
when you put the tile on.

Square and U are pretty close, V might not leave enough thinset

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thetiler wrote:
Back butter them with the flat side of the trowel.
The 1/4 x 3/8 trowel should be fine for 12 x 12 tiles.

thetiler

Does it matter if it's U, Square or V shapped?