PU-30 Low Modulus High Performance Construction Polyurethane Sealant It is polyurethane based, single part, UV and weathering resistant elastomeric joint sealant. Polyurethane sealants are used to seal joints in a wide variety of construction applications. Recommended Uses Indoor and outdoor areas for vertical and horizontal applications Interior and exterior areas for vertical and horizontal applications Above grade joints of structures Restoration of joints in old and new b