C.R. LAURENCE V116BRZ CRL Bronze Vulkem 116 Polyurethane Sealant. CRL Vulkemr 116 Sealant is a one-part moisture curing, gun grade polyurethane sealant. Vulkemr 116 is durable, flexible, and offers excellent performance in moving joints. No primer is required on most construction materials, and it applies with conventional caulking guns.. Part Numbers Variations: V116BRZ