DK 700 Class 1 Vapor Barrier is a 2 component solvent-based urethane primer, 97% solids, low VOC (<40 g/L), class 1 vapor barrier that meets ASTME96-E93. DK 700 stops water vapor transmission, to less then 1/2 pound per 1,000 sq. ft. This unique water vapor barrier opens up the possibility of applying high performance resinous coatings, including all Dura-Kote Systems, to uncured or moisture-laden concrete that was never before possible.