Mastic is applied to 2-3 layers and each layer is reinforced. After application, the mastic hardens and forms a continuous seamless rubber -like coating, which has good protective and waterproofing properties. Various types of mastics can have different resistance to ultraviolet. Therefore, to protect and extend the service, for example, bitumen mastics, it is recommended to cover them with sprinkling of small gravel, large sand, river pebbles or apply special paints on top.