SL Base Surface Leveling Coating is a 100% silicone coating with a green color and a slight odor. SL Base is designed to be used as a surface-leveler on roofing projects in which the surface is too rough or uneven to apply a roof coating, such as gravel surface built-up roofs and “alligatored” areas of a smooth surface built-up roof. This coating can be applied to the roof surface via heavy-duty airless spray unit (recommended) or rolled on. After application, SL Base will settle into the lowest points on the roof and provide a smoother surface. The roof surface will not be completely level and some rocks will still be visible. As a general rule, no rock should be protruding more than ¼" after the installation of this product.