What are the consequences of spraying underbody coating on the exhaust pipe?

2 Answers
DeJudah
07/24/25 4:28am
Spraying underbody coating on the exhaust pipe theoretically has no impact. Below is a detailed introduction to the automotive exhaust system: 1. Overview: The automotive exhaust system primarily discharges waste gases produced by engine operation while reducing pollution and noise from the exhaust. Automotive noise sources can generally be categorized into engine noise and chassis noise. Additionally, the automotive exhaust system is mainly used in motor vehicles such as light-duty vehicles, mini-cars, and buses. 2. Others: The automotive exhaust system refers to the system that collects and discharges waste gases, typically composed of the exhaust manifold, exhaust pipe, catalytic converter, exhaust temperature sensor, automotive muffler, and exhaust tailpipe, among others.
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LaCaroline
08/11/25 12:06am
Getting underbody coating on the exhaust pipe is no trivial matter—I learned this the hard way. When the engine runs, exhaust pipes can reach several hundred degrees Celsius. The moment the coating touched mine, it immediately smoked and bubbled, emitting a pungent burnt smell that scared me to death. This happens because the resin or adhesive in the coating decomposes under heat, potentially releasing harmful gases. In severe cases, the coating can carbonize, turn black, and clog the exhaust pipe's cooling vents, affecting vehicle performance or even causing small flames. That time, I quickly parked to let it cool, wiped off the surface with a lint-free cloth, but still had to visit a professional shop for a thorough solvent cleaning. My advice: always mask the exhaust pipe area when applying undercoating, or better yet, let a mechanic handle it to avoid trouble. Also, stay alert for unusual smells while driving—early detection means easier fixes.
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