Parex USA’s 121 Optimum Lite EIFS Base Coat & Adhesive comes in a 33-lb. bag but delivers the same coverage as 121 Optimum Finish in a 50-lb. bag. By reducing weight without reducing coverage, the product decreases shipping costs and carbon footprints. 121 Optimum is a base coat for Parex exterior insulation-finishing system and an adhesive to laminate EPS to listed substrates. It is applied without the addition of cement and is mixed on site with water. Its water base is VOC compliant, and the base coat and adhesive has an extended pot life.