Chimney coatings, also known as soots, are a type of protective coating that is applied to the inside of chimneys. They are designed to protect the chimney from the heat and smoke generated by the fire, as well as to prevent the buildup of creosote and other combustible materials. Soots are typically made from a variety of materials, including clay, sand, and cement. They are applied in layers and can be either sprayed or brushed on.