Vulkem 116 Limestone 10.1 oz. Polyurethane Sealant is a one-part, moisture-curing, gun-grade polyurethane sealant. It is durable, flexible and offers excellent performance in dynamic joints. Vulkem 116 is an excellent general-purpose sealant designed for use on poured and precast concrete, only work, window and door perimeters and similar types of construction joints. It is designed for use on exterior applications but can be used on interior applications with proper ventilation.