The correct floor tiling trowel will give a 100% coverage, meaning once you've bedded the tile in the adhesive correctly using the 'twist' action and pull the tile back up, you should see no air pockets under the tile which means the tile is 100% covered with adhesive.
The old 'spot-fix' method isn't used as British Standards as using just small blobs of adhesive on the back of the tile will cause the tile to break should anything heavy be rested on it.
The correct tiling trowel for floor tiling has half-moon shaped cut-outs in it every inch that are about the size of half of a 50 pence peice. More modern versions have cut-outs between these 'round notches' which allow more adhesive to be left behind when using the trowel correctly.
The old 'spot-fix' method isn't used as British Standards as using just small blobs of adhesive on the back of the tile will cause the tile to break should anything heavy be rested on it.
The correct tiling trowel for floor tiling has half-moon shaped cut-outs in it every inch that are about the size of half of a 50 pence peice. More modern versions have cut-outs between these 'round notches' which allow more adhesive to be left behind when using the trowel correctly.