Vulcanox II is a two-part, catalyzed, elastomeric, urethane joint sealant used to seal and caulk both moving and non-moving joints and cracks. Vulcanox II is used in both interior and exterior applications when a rapid cure sealant is required. Vulcanox II is used as a concrete joint filler for expansion joints or control joints. It can also be used to seal around windows and door frames and to seal joints in masonry and flashing. It may be applied to wood, concrete, masonry, metal, stone and firmly bonded painted surfaces.