GacoFlex UB64 liquid polyurethane is a hydrolytically stable, fire retarded, two-component elastomer. It is for use as a base coat on roofs, mechanical room floors, walking and traffic decks where polyurethane coating systems require fire retardance, toughness, fast cure and good solvent resistance. Suitable substrates include plywood, polyurethane foam, properly primed concrete and metal.