Bricklayer's putty is a type of MORTAR used by bricklayers to fill in the gaps between bricks and other masonry materials. It is a paste-like material made from a combination of Portland cement, hydrated lime, and water. It is used to create a waterproof seal and to provide a smooth finish to the surface of the brickwork. MORTAR is an essential part of any bricklaying job and is used to hold the bricks together and to ensure that the structure is strong and durable.