Loctite retaining compounds loctite 142442 loctite 603 is a high strength retaining compound designed for the bonding of cylindrical fitting parts especially for sintered bearings and also where consistently clean surfaces cannot be assured loctite 603 cures when confined in the absence of air between close fitting metal surfaces and prevents loosening and leakage due to shock and vibration loctite 142442 603 retaining compound high strength 50ml