An important class of specialty isocyanates includes one-component systems that cure with moisture. One-component PU systems are prone to surface foaming and require special surface preparations. Since it is more convenient to apply a single one-component primer system compared to a two-component system, Huntsman has developed a new moisture-cure MDI, SUPRASEC® 9611, which has low viscosity, low foaming characteristics and is VOC free. This paper addresses physical properties, reactivities and primer processing conditions of this new moisture-cure MDI and compares the properties to existing primer systems.