Black Swan's no-hub sealant is an amber colored, smooth flowing, semi-viscous liquid for use as a coating on black pipe to improve leak-free sealing of no-hub couplings. The high performance polymer resin compound is elastic and resists vibration and temperature change. It is a fast drying sealant that cures by solvent evaporation resulting in an elastic membrane that adheres to both pipe and coupling gasket, providing a flexible adherent membrane coating. Gaskets on nonporous surfaces may be taken apart at anytime without injury to sealed surface.

Applications: For used on aluminum, brass, steel, copper, epoxies, plated metal, fiberglass, black pipe, galvanized pipe, glass, wood, paper, felt and cork, should not be applied on painted surfaces or plastic pipes, such as PVC, CPVC or ABS

• MSDS https://www.plumbers-supply-co.com//ASSETS/DOCUMENTS/ITEMS/EN/UNI-PS7025_MSDS.pdf