Vulkem® VULKEM116-BLANC 116 Black Textured Single-Component Polyurethane Sealant For Concrete. Vulkem 116 is an excellent general-purpose sealant designed for use on poured and precast concrete, masonry work, window and door perimeters, and similar types of construction joints. Vulkem 116 is approved for exterior applications and the coverage is 308 linear feet of joint per gallon for a 1/4" x 1/4" (6 mm x 6 mm) joint.