Polyurethanes are based on a moisture and catalyst curing technology, and are available in one-part or two-part liquids and hot melt forms. The characteristics found in cross-linking polyurethane adhesives have exceptional structural integrity, durability and strength. The composition cures to a quality structural bond and adheres to variety of difficult materials. Reactive hot melt polyurethanes, as well as liquid formulations, are used and specified for many challenging applications.