Automotive sealants are substances used to fill gaps, seal seams, or bond parts of a vehicle to prevent the ingress of water, air, dirt, or other contaminants. They play an essential role in the durability and performance of cars, trucks, and other vehicles by enhancing protection against rust, corrosion, and other environmental factors. Sealants are commonly applied in areas like door seals, windows, windshields, and engine compartments, and are available in different forms depending on the specific need.