Wall coatings are a type of protective covering that is applied to the exterior of a building. PLASTERS are one of the most common types of wall coatings, and are made from a mixture of lime, sand, and water. PLASTERS are applied in a thin layer to the surface of the wall, and can be used to create a smooth, even finish. They are also highly durable and resistant to weathering, making them an ideal choice for protecting the exterior of a building.