Loctite 577 is designed for the locking and sealing of metal pipes and fittings as well as other threaded assemblies. The product provides an instant, low-pressure seal for metal pipes and fittings. It will not creep, shrink or shred. It has excellent chemical and thermal resistance and offers less migration of liquid product after application. Medium-strength, general purpose thread sealant for straight/straight and straight/taper threads and fittings. Fills the space between threaded parts and seals and locks at the same time. Medium-strength, general purpose thread sealant for sealing metal threads. Suitable for all metals. Instant low pressure seal. Excellent chemical resistance. Locks connection against vibration-induced loosening and other stresses. Easy to apply. Cures on active and inactive metals