Putty knife is like a universal tool, which is mainly used in decoration in four aspects: scraping, shovel, coating and filling. Scraping refers to scraping off impurities on the wall, removing ash, or puttying; Shovel, that is, putty knife can be used to shovel Wall skin, shovel cement, shovel white ash, etc.; Coating, can be used to apply putty; Fill, can be used to fill the cracks, cracks, etc. of the wall. In addition, it can also be used with plastering trowel to mix putty. These functions can assist decoration and become an essential tool.