DS-270 DeckCast™ is a two component, 100% solids, one part Side A isocyanate to one part Side B poly by volume, self-leveling basecoat for use under DS-100 aliphatic topcoat. DS-270 is a waterproof membrane classed as a vapor barrier and rated for use as a method of containment of standing water over occupied spaces. DS-270 can be applied over a variety of properly prepared substrates, including concrete, wood, fiberglass and metal. Most common applications include pedestrian balconies and walkways, roof top patios or pedestrian traffic areas. DS-270 is a proven performer in both commercial and residential construction.