1) Automotive technology 2) Seal 3) Undercoat 1) Undercoat 
Underseal is a thick resilient coating applied to the underbody or chassis of an automobile to protect against impact damage from small stones, which would rapidly chip ordinary paint, allowing rusting to begin. Historically a bitumen-based compound was used, but after approximately a decade this becomes brittle and water can become trapped betwee...
noun seal consisting of a coating of a tar or rubberlike material on the underside of a motor vehicle to retard corrosion