Which parts should not be sprayed with chassis armor?
2 Answers
Generally, chassis armor should not be sprayed on areas such as the engine oil pan, transmission housing, exhaust pipe, wiring harnesses on the chassis, steering shaft, shock absorbers, etc. Additionally, the brakes and suspension should be wrapped with newspaper, and the exhaust pipe and tires must be completely removed before spraying. Since chassis armor can melt when exposed to high temperatures, posing safety hazards, parts of the vehicle that generate high temperatures during operation should not be sprayed with chassis armor. Before spraying chassis armor, the vehicle's chassis should be thoroughly cleaned. Use a lift to raise the car to remove the wheels and inner fender protective panels. Then, use a high-pressure water gun to rinse the chassis, removing any adhered dirt and sand. For areas with severe dirt buildup, a wire brush can be used to scrape it off until the metal base of the chassis is exposed.
Last time I DIY sprayed the undercoating, I made a mistake by spraying near the exhaust pipe. The high temperature caused it to melt and smoke, which gave me quite a scare. Since then, I've been extra careful to avoid several key areas: don't touch the entire exhaust system as heat can burn off the coating or cause fires; avoid spraying brake discs and calipers because the coating can accumulate dust and affect braking performance; stay clear of ABS wheel speed sensor areas to prevent false warning lights; don't coat rubber bushings like shock absorber pads as the coating can harden, crack, and lead to water leakage; and avoid any moving parts like drive shafts where thickened coating may cause jamming or strange noises. Before spraying, I now thoroughly clean the undercarriage and use tape to cover all sensitive areas—otherwise, repairs can be troublesome and costly. Don't follow my initial mistake; proper protection ensures the undercoating truly prevents rust and corrosion while extending your vehicle's undercarriage lifespan.
