Fasto LockSeal HS is high strength, anaerobic thread locker & sealant. LockSeal HS cures when confined in the absence of air on close-fitting metal surfaces. LockSeal HS is slightly oil tolerant, so it will bond some ‘as received’ parts, but best results are obtained with clean substrates. LockSeal HS to be used for locking & sealing where high strength opening is required. LockSeal HS prevents corrosion of assembled parts.