Underbody Coating

Submitted by: Syed Rizwan Ali
Course: Automotive sheet metal design using Seimens NX Cad
Challenge 2: Under-body Coating

What is Under-body Coating?
Ans: Underbody Coating is a sprayable coating, which protects the undersurface of the vehicle from corrosion.

Underbody coating provides long-term protection from corrosion to the car's underbody. It also protects parts like internal body panels, frame rails, and other inner cavities that are not physically accessible but are prone to corrosion.

Protecting the underbelly of the car should be our top priority. Especially during monsoons when heavy precipitation causes the roads to become mini-rivers and our cars are left stranded there. This makes them prone to heavy corrosion in the underbody region.

It protects the underbody substrates from:

• Environmental conditions

• Impacts

• Dampens sound and vibration

• Insulates against cold and heat

• Protects against Corrosion

• Seals off seams

• Hides welds, repairs & bodywork with spray

Process-

• BIW get DI misting SPray and E-coating misting spray

• Then from loaded conveyor BIW of the vehicle goes into the ED tank Or

• Most undercoating is generally applied with a spray gun. A disposable spray gun will work best; once the undercoating hardens, it becomes very difficult to clean the gun even with a lot of thinners. A Schutz disposable spray gun is the best option.

• No matter what type of vehicle undercoating you've selected, two coats will provide the optimum protection. Allow ample dry time between coats.

• Now from ED tank it goes to Heating chamber

• Let the undercoating cure completely (usually overnight) before driving your vehicle on the road

Pros-

• Minimizes Sound: It minimizes the sound from underneath the car resulting a noiseless, smooth driving experience.

• Heat Insulation: It insulates the interior of the car from extreme temperatures from beneath the vehicle providing a comfortable cabin experience.

• Anti-chipping property: If any stone hits the coating it does not get chipped away hence protects the underbody from exposure to water.

Cons-

• Apllying underbody coating will not have any effect to the already corroded part.

• Undercoating is costly.

• Since the corrosion itself starts after few year, underbody coating is not preferable to ower who change their car after few year.