From the #1 Silicone Brand, Supreme Silicone Kitchen & Bath sealant is a premium, 100% silicone and 100% waterproof sealant ideal for areas constantly exposed to moisture. This 30-minute water-ready formula has 100% more flexibility than Class 25 sealants and has 7X stronger adhesion than Silicone 1 sealant. It offers 50% joint movement capability for a shrink and crack-proof seal. This sealant also resists mold and mildew growth with lifetime mold-free product protection. Backed by a lifetime guarantee.