In areas of DSD-2 and DSD-3, MPI #77 epoxy is used for priming purposes. This provides a hard alkali-resistant base and the polyurethane topcoat provides chemical and abrasion resistance combined with color and gloss retention properties.High performance polyurethane coatings have evolved from industrial to commercial and architectural use. Durability, chemical and solvent resistance and general toughness of the finish are typical properties of these coatings. This is a solvent-based, 2 component aliphatic polyurethane coating for use where abrasion, weathering, chemical and solvent resistance is required on exterior concrete surfaces in industrial, commercial and marine environments. It has excellent chemical and abrasion resistance. Good for high traffic areas. Resists the strong solvents used in graffiti removal. Contains strong solvents that could lift conventional primers. Uses include storage tanks, towers, chemical plants, breweries, waste treatment plants, bottling plants, etc. Excellent anti-graffiti system and an excellent topcoat over epoxy coatings where gloss and color retention are paramount.