My-T-Lok? 257 is a single component, medium strength, anaerobic flange sealant which cures when confined in the absence of air between close fitting metal surfaces. Special Features:Room temperature cureProvides resistance to low pressures immediately after assembly of flanges.The thixotropic nature of reduces the migration of liquid product after application to the substrate. 1. Typical applications include sealing close fitting joints between rigid metal faces and flanges. 2. Typically used as a form-in-place gasket on rigid flanged connections, e.g. gearbox and engine casings, etc.