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