The everbuild range of everflex silicone 335 construction sealants are 310ml sized cartridges that are available in 5 colours brown white transparent grey and black all these colours will fit most common mastic or sealant guns 355 is a low modulus reactive curing silicone sealant that cures quickly to reduce dirt pick up everflex silicone 335 remains permanently flexible forming a weather tight rubber like seal tested to iso 8339 and iso 10590 10563 and has a faster curing time than conventional