Urethane adhesives are single component, moisture curing adhesives, which cure upon exposure to moisture in the atmosphere or substrate. The minimal quantity of carbon released during the process of cure has little to no effect on the process of bonding. However, under humid conditions, this can result in thick bond lines or foaming. In case of low humidity, or substrates that have very low permeability to moisture, moisture is added to trigger cure. Cured adhesives have flexibility and elasticity. However their properties can be adjusted depending on the application. For instance, they can be soft, flexible, and rigid. Urethanes can be formulated to be highly flexible, which makes them ideal for bonding elastomers, foils, and films. Furthermore, their adhesion properties have led to an extensive application in the automotive industry.