Notched putties

When gluing ceramic tiles, both wall and floor, it is very important to apply the adhesive with a layer of the appropriate thickness. This is only guaranteed by the use of a putty or a notched trowel. When pushed on the ground, it allows the mortar to pass through only between the teeth, so only in the right amount. And this one depends on the size of the tile. Therefore, you need to choose a putty with a certain size of teeth. The rule is, that the larger the size of the tile, the larger the teeth of the trowel and vice versa.