Underbody Coating

UNDERBODY COATING:

Underbody coating is a dense cladding applied uniformly to the under body of an automobile and it is also knwon as anti-corrosion coating. Due to road condition, automobile's underbody is more prone to corrosion. Underbody coating is mostly used for to stop the corrosion at the bottom of the automobile. It also protects other component of vehicle such as internal body panels, frame rail and other cavities that are not physically accessibile but prone to corrosion.

Under body Coating of an Automobile

Corrosion rate of this coating can be found by the fallowing formula:

R = k(wi-wf) / ATρ

where,

R = corrosion rate, mm/year

wi = initial wieght, g

wf = final wieght, gρ

A = Total surface area, mm

ρ = density gm/cm2

K = unit conversion constant

Conventional Vehicle Painting Process

Coating layer, Thickness and Function

TYPES OF UNDERBODY COATING:

Different types of underbody coatings are

1. RUBBERIZED UNDERCOATING:

   Rubberized car undercoating is simple to apply and provides sound insulation as well as protection from dust, moisture, and dents. It is safe to apply on wheel wells and quarter panels, as well as your undercarriage, and dries to a soft rubbery texture that prevents further rust, damage, or moisture seeps. The coating can be painted over and quickly removed with an undercoating remover spray if necessary for bodywork. Therefore, rubberized coating is the greatest option for safeguarding your vehicle's undercarriage since it offers the most straightforward and effective protection against rust and moisture.

2. POLYURETANE UNDERCOATING:

   A polyurethane-based sealer is another choice for undercoating your vehicle. This sort of undercoating for vehicles is a little faster and easier to apply. It is frequently sold in canisters that are ready to be loaded into an application gun. This form of sealant bonds with and protects unoxidized metal by seeping into all cracks and seams, displacing salt and moisture, and oozing around rusty regions. It also sands fast in the event that bodywork is required, and it may be painted over. This sort of automotive undercoating, on the other hand, usually necessitates a little more surface prep work before application, such as sanding and applying an etching primer to exposed metals.

3. WAX OR PARAFFIN BASED UNDERCOATINGS:

   A paraffin-based undercoating will be the most cost-effective and time-efficient way to protect your vehicle's underside. Keep in mind, however, that it will wear off faster than other undercoatings and will need to be stripped and redone annually. Undercoatings made of wax never truly harden. They drip or run into seams and cracks during application to give protective characteristics. They come in spray gun canisters or aerosol cans and provide at least a base level of protection in fairly humid climates.

4. ASPHALT BASED UNDERCOATINGS: Any of the aforementioned types of undercoating will provide adequate protection for basic automobiles. Asphalt-based undercoating adds a layer of protection against pebbles, chips, and moisture for large trucks and heavy gear. A small amount of rubberized material is usually included in asphalt-based undercoatings to help them form up firmly and soften noise. This form of undercoating, which is often offered in five gallon containers, requires more cure time than the other three and is NOT paintable, making it best suited for usage on undercarriages.

ADVANTAGES OF UNDERBODY COATING:

1. Undercoating provides an extra layer of protection against rust and corrosion, protecting automobile.
2. It increases the life and value of the automobile.
3. Abrasion and chip resitant protection is provided by underbody coating.
4. It reduces the noise during the operating conditions.
5. It provides insulation from hot and cold climatic conditions.
6. These coating also makes the process of cleaning easy.

DISADVANTAGES OF UNDERBODY COATING:

1. Underbody coating is costly and requires periodic maintenance.
2. For the best performance, oil-based rustproofing should be reapplied every year.
3. Underbody coating should still be visually inspected annually to ensure integrity.
4. Proper skilled labour is required of proper underbody coating. Even just one crack left unsealed will allow rust to form and leave an automobile susceptible to corrosion and system harm.