Method of applying a polyurethane adhesive to a substrate

A method for applying a two-part polyurethane adhesive to a substrate, the method comprising:

• providing an isocyanate blend in a first package, wherein the isocyanate blend exhibits less than a 20% change in viscosity over 60 minutes when exposed to atmosphere between approximately 0 degrees F. and 120 degrees F., and wherein the first package has a first opening and a first cap secured to the first opening;
• providing a polyol blend in a second package, wherein the second package has a second opening and a second cap secured to the second opening;
• removing the first cap and the second cap thereby exposing the isocyanate blend and the polyol blend to air;
• attaching a first connector to the first opening and attaching a second connector to the second opening;
• connecting the first connector to an applicator device and connecting the second connector to the applicator device;
• activating a prime mover for providing an output torque;
• a pump receiving the output torque from the prime mover through a gear box;
• pumping the isocyanate blend from the first package and the polyol blend from the second package using the pump;
• mixing the isocyanate blend with the polyol blend;
• and
• applying the mixed isocyanate blend and polyol blend onto the substrate.