Tarlike coating sprayed on the underside of an automobile to prevent rust and to dampen vibrations.

防锈底漆(焦油状封漆，喷涂在汽车底层以防锈、防震)。

A usu. asphalt-based waterproof coating applied to the undersurface of a vehicle.

内涂层；底涂层(汽车底面上的一层防水涂层，通常以沥青为主要材料)。