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A notched trowel is used to spread adhesive and thin-set. It differs from a regular trowel in that it has notches, on two sides of the blade. Running a notched trowel over adhesive or thin-set leaves behind rows of the product. How much adhesive is left behind depends on the size of the notches; the larger the notch, the more material is left behind. The proper size notch depends on the size of the product being installed. Larger notches are required for larger tiles, while smaller notches are more commonly used to install small tile.