Underbody Coating

Underbody Coating:

Underbody Coating is a sprayable coating which protects the under surface of the vehicle from corrosion.

Underbody coating provides long term protection from corrosion to cars 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 underbody of the car should be our top priority. In monsoons due to rains heavy corrosion in the underbody region would occur if Underbody Coating is not done.

Underbody of the cars will be made from durable metals such as steel which can easily be damaged and oxidized also forms rust as it is exposed to muddy water, stones, rugged roads, and potholes. This makes it prone to wear and tear which is often not in plain sight but could lead to serious issues. keeping this in mind underbody coating is required.

A protective coating composition for motor-vehicle underbodies and gravel guards, characterised in that it comprises, in percentages by weight of the total weight of the composition:

PVC (PVAc) Resin	20-40%
Plasticiser	30-50%
Adhesion promoter	0.5 - 1.5%
Natural coated fillers	20-30%
Additives and Pigments	1-3%
Swelling Agent	1-3%
Phenolic resin (resorcin)	0.2-1.2%
Solvents	1-3%

The below are the types of UNDERBODY COATING:

Rubberized Underbody Coating

This is generally thought of as the best underbody coating for your car. It preserves the underbody well, protecting it from scratches. Applying this to the undercarriage is not much of a hassle either.

Wax Based Underbody Coating

This – more or less – ephemeral undercoating will wear away in a few months’ time. On the upside, wax-based undercoating puts up a big fight against moisture. It is also the most affordable option out there.

Asphalt Based Automotive Undercoating

Best suited for lorries, trucks and large vehicles this provides a greater degree of protection compared to rubber-based coatings. However, asphalt-based coatings contain little amounts of rubber for sound-insulation purposes. The process of applying this coating is a bit time-consuming though.

Polyurethane Underbody Coating

This coating closes up splits and fractures on the underbody of the vehicle. It offers up good protection against corrosion and also bonds with the metal. Unlike in the case of asphalt-based coating, you can paint over the polyurethane coating

The below image shows an example of how the underbody of a car looks before and after coating

Advantages:

1. Minimizes Sound: It minimizes the sound from underneath the car resulting a noiseless, smooth driving experience.
2. Heat Insulation: It insulates the interior of the car from extreme temperatures from beneath the vehicle providing a comfortable cabin experience.
3. Anti-chipping property: If any stone hits the coating it does not get chipped away hence protects the underbody from exposure to water.
4. Fights Rust: It plays an important role in keeping corrosion at bay. Underbody coating can come in handy especially if you live near the sea, where there is too much humidity, and rusting is just one of those everyday things. You should also seriously consider undercoating if you reside in a place where it snows in winter.

Disadvantages:

1. It is less helpful if corrosion is already present.
2. Underbody coating is costly.