Can Chassis Armor Reduce Noise?
3 Answers
Chassis armor not only reduces noise but also provides functions such as corrosion prevention, stone impact protection, vibration reduction, and fuel savings. Below is an introduction to chassis armor: Specific functions of chassis armor: Chassis armor involves covering areas that cannot be sprayed, such as screws, oil pipes, the motion system, and the cooling system. After this treatment, the chassis effectively seals panel gaps, reducing interior noise and integrating the chassis into a single unit. This significantly decreases resonance-generated noise during driving. When a car travels on rough roads, sand and gravel kicked up by vibrations continuously collide with the chassis and wheel rims. Chassis armor protects the original anti-corrosion paint and hot-dip galvanized layer of the chassis, preventing exposed metal from coming into contact with moisture and haze in the air, which can cause rust. It also strongly resists the rapid spread of rust, which can corrode internal shell components. Other functions of chassis armor: Prevents chassis corrosion; protects against stone impacts during driving; reduces vibrations from wheels, engines, and other components; provides heat insulation and fuel savings in summer; lowers vehicle maintenance costs, extends vehicle lifespan, and preserves car value.
As a veteran mechanic with years of experience, I believe undercoating does provide some sound insulation. After applying this resin or rubber-based coating, the most noticeable effect is the reduction of that tapping sound from pebbles hitting the undercarriage, especially when driving on gravel roads. However, its primary function is rust and corrosion prevention—don't expect it to completely eliminate cabin noise. Major noise sources like tire roar and wind noise still require soundproofing materials in doors and undercarriage insulation. I recommend professional installation; overly thin coatings have poor effectiveness. I've seen some car owners try DIY applications to save money, only to have it peel off within two months.
When I had the underbody coating installed on my new car last year, the technician was quite honest: the sound insulation effect is more of a 'bonus.' After application, driving on asphalt roads did feel quieter, especially with reduced splashing noise from wheels on rainy days. However, at high speeds, engine and wind noise remained largely unchanged, almost as if nothing was installed. The most practical benefit is actually rust protection, particularly on roads treated with de-icing agents during northern winters. If you're installing it solely for noise reduction, it's not very cost-effective—a set of quiet tires would make a more noticeable difference. Remember to choose eco-friendly materials, or the chemical smell in summer can be overwhelming.
