SL Base is a high-performance, 100% silicone, surface-leveling coating that transforms even the roughest substrates into a smooth, uniform base for a silicone top coat. It fills voids and settles into low spots, ensuring aggregate protrusions are no more than ¼ inch. Ideal for gravel-surfaced BUR, “alligatored” BUR, granulated modified bitumen, and concrete, SL Base is ready to use from the 5-gallon pail. With low-VOC (<50 g/L), high-solids (90% by volume) formulation, it can be applied by airless spray or roller and cures in 4–48 hours. The coating delivers excellent coverage and adhesion, streamlines prep, reduces material waste, and extends the service life of the roof system. Cleanup is simple with mineral spirits, and the 24-month shelf life ensures it’s ready when you are.