1 x Everbuild 500 Bath Sanitary Silicone Sealant Manhattan Grey 290ml The Everbuild Range of Everflex Silicone 500 sanitary sealants are 310ml sized cartridges, that are available in a range of colours. All these colours will fit most common mastic or sealant guns. Everbuild 500 range of silicone sealants cure quickly to provide a permanently flexible, high strength waterproof seal. Specifically designed for sanitary applications, they contain a powerful fungicide to prevent mould growth. They remain permanently flexible, forming a tight rubber-like seal, and have a faster curing time than conventional low mod sealants. With an extremely low dirt pick up, they are also flexible and waterproof giving a good sound seal for a professional finish. Everflex Silicone 500 Sanit.