General Purpose Silicone is a mild modulus silicone sealant that adheres to most smooth and non-porous materials. Contains an anti-fungal compound to prevent mould growth in areas of high humidity. Forms a permanently flexible rubber seal. General Purpose Silicone is a mild modulus silicone sealant that adheres to most smooth and non-porous materials. Contains an anti-fungal compound to prevent mould growth in areas of high humidity. Forms a permanently flexible rubber seal.