Underbody coating can provide many advantages for a car, including: Protection from rust and corrosion Underbody coating protects the metal components of a car from rust and corrosion, which can damage the frame rails and silencer. Reduced noise Thick undercoating can absorb noise, making for a quieter driving experience. Prolonged car life Underbody coating can protect the engine and transmission, reducing wear and tear and extending the life of the car. Thermal insulation Underbody coating can provide thermal insulation, making road trips more comfortable in the summer. Prevents paint chipping Underbody coating can prevent paint chipping from sharp gravel or other objects hitting the car. Protects against poor road conditions Underbody coating can protect against damage from dust, moisture, rocks, and salt from water during monsoon. Undercoating is especially beneficial for older cars, but any existing rust will need to be removed before applying the coating