Ultrabond ECO 420 is a proprietary, water-based adhesive formulation designed for both indoor and outdoor carpet. Ultrabond ECO 420 offers high-moisture-resistant characteristics and excellent bond properties for interior and exterior broadloom carpet installations. Ultrabond ECO 420 is also perfectly suited to bond reground rubber underlayments such as Mapesonic™ RM for ceramic tile installations. Due to its unique formulation, it can be installed without the need for moisture testing.