What's the name of the gray glue under the Volkswagen chassis?

Chassis antirust adhesive is a kind of gray synthetic rubber material, which is used for antirust protection of automobile chassis. It has excellent corrosion resistance, aging resistance, air tightness and waterproof performance, and can effectively prevent the chassis from being eroded by vibration, vibration and moisture. Chassis antirust glue can provide stability and safety, protect the chassis from corrosion and damage, and prolong the service life of the car.