Now handier than ever, Silicone Sealant for watch gaskets is available in an easy-to-use box! The sponge is permanently attached inside and impregnated with silicone grease so there is less waste and never grease where you don't need it. Silicone grease is the best gasket sealant available, because it is water repellent and keeps gaskets lubricated and flexible for a lighter, longer seal.