Everbuild General Purpose Silicone is a Multi-Purpose acetoxy cure silicone sealant that cures quickly to provide a permanently flexible, high strength waterproof seal. It contains a powerful anti-fungicide to prevent mould growth. Everbuild General Purpose Silicone is a Multi-Purpose acetoxy cure silicone sealant that cures quickly to provide a permanently flexible, high strength waterproof seal. It contains a powerful anti-fungicide to prevent mould growth.