Underbody Coating

UNDER-BODY COATING:

Underbody coating is a thick resilient coating applied to the underbody or chassis of an automobile to protect against impact damage from small stones, which would rapidly chip ordinary paint, allowing rusting to begin. It 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.

ADVANTAGES OF UNDER-BODY COATING

The following are the major advantages of Under-Body Coating,

• Protection from Rust:

It has a crucial function in preventing corrosion. Underbody coating is particularly useful if you live near the sea, where there is excessive humidity and rust is a common occurrence. If you live somewhere where it snows in the winter, you should seriously consider undercoating. During the monsoon season, cars are at high risk of getting corrosion.

• Noise Reduction:

Very strong undercoating, realize it or not, can attenuate noises that enter the cabin. The undercoating, which is frequently made of rubber, absorbs part of the rackets. The car’s occupants could avoid the road sounds — at least to some extent. So if you want a quiet ride and a pleasant experience it is always a good idea to consider getting an underbody coating

• Prevention of high-value components:

A good undercoat protects not just the underbody from corrosion, but also the engine and gearbox! Less corrosion combined with slower wear and tear can extend the life of your car by many years. On the undercarriage, there would be fewer dents, dings, and scratches to worry about.

• Prevents Paint Chipping:

Running on the highway or while pacing through a city road, you will often encounter sharp gravel or any other unattended object hitting the belly of your car with high momentum. This scrapes and chips off the metal from down below. A thick layer of Underbody Coating definitely comes to aid and minimizes the effects of such contacts on the body.

AUTOMOTIVE COATING PROCESS:

The Automotive Coating Process has 5 major steps, which are,

• Pre-Treatment
• Electrodeposition (ED)
• Sealer Application
• Primer Application
• Top Coat

Pre-Treatment:

Pre-Treatment is the basic process of cleaning the body surface of a BIW to remove oil remains, and welding residues. This is usually carried out in 3 liquid dip processes of degreasing, conditioning, and phosphating. It is the first step in preparing BIW.

The degreasing solution is composed of alkaline salts and surfactants and can include caustic soda, tri-sodium phosphate, and sodium carbonate.

Electrodeposition (ED):

The Electrodeposition process is the very essential process where the entire BIW is electrodeposited to prevent it from rusting and corrosion. The ED processes are modified as per the material of BIW

Sealer Application:

Sealer Application is a process in which seam sealing using PVC and urethane is applied to the welded joints of the BIW. The sealant is applied around and inside the doors, hood, trunk, and front dash and onto the exterior and interior of metal joints and the outer area of the back wheel well.

Primer Application:

Primer application is the process in which a primer is applied to the BIW. These primers are used to improve adhesion between the E-coat and topcoat, provide chipping protection, and enhance paint appearance.

Top Coat:

The Last step in the process is to apply the Top Coat, which consists of two layers—the basecoat and the clear coat. The basecoat contains the primary coloring pigment and the clear coat provides a protective coating against environmental effects, corrosion, and UV light.

TYPES OF UNDER-BODY COATING:

• Wax or Paraffin-based Undercoating
• Rubberized Undercoating
• Polyurethane Undercoating
• Asphalt-Based Undercoating
• Water-based Undercoating
• Petroleum-Based Undercoating

Wax or Paraffin-based Undercoating:

It is the preferred undercarriage coating for cars often driven on highways and normal roads. Sometimes referred to as wax-based undercoating, it provides sufficient guard for cars in fairly moist regions.

Pros:

• Readily flows into seams to guarantee any exposed and prone surfaces are protected
• The most inexpensive undercoating option
• Conveniently available in spray guy canisters or aerosol cans

Cons:

• Wears off quicker in comparison to other types
• Unlike the rubberized type, it does not really dry
• Needs to be stripped and reapplied at least once a year as soon as signs of wear and tear start to show

Rubberized Undercoating:

Ideal for cars driven in rough terrain, as its name suggests, this undercarriage coating involves applying a rubber agent to the underbelly to protect and cushion it against dents, dust, and moisture. It can also be applied around wheel wells and quarter panels. Considered the best option for standard vehicles when it comes to the different types of undercoating.

Pros:

• Easy to apply
• Quickly applied with no fuss
• The undercoat can be painted for a neat finish
• Provides satisfactory protection
• The simplest way to undercoat your car
• Safe to apply
• Truly dries to a soft rubbery finish that prevents further rust, damage, or moisture seepage

Polyurethane Undercoating:

It uses a polyurethane-based sealant that comes in canisters ready to be loaded into a spray gun and sprayed to guard the undercarriage of your vehicle. The polyurethane used in this product is a high-quality and durable material that is perfect for any weather condition. It is ideal for standard vehicles.

Pros:

• It has a long lifespan and is resistant to wear and tear
• Easily and quickly applicable
• Trickles into cracks and rusty spots already present on the underbelly of your car and fill them, hence protecting the underlying metal
• Quick and simple to remove, as it sands easily
• Dislodges salt, moisture, and oozing around rusty areas to bond with and protect unoxidized metal
• Can be painted over

Cons:

• For better adherence, needs undercarriage preparation before application
• Requires time-consuming etching with primer to bare metals

Asphalt-Based Undercoating:

It is made of asphalt and generally also contains some rubberized material that sets up firmly and helps soften noise from the engine. It reportedly has the most damage-resistant properties. Although asphalt-based undercoating is ideal for trucks, military, and all-terrain vehicles, it will also help protect your car, truck, motorcycle, and heavy machinery from the elements. It last long and is best for endurance vehicles that have to undergo heavy road use.

Pros:

• Formulated to protect from dirt, rust, and corrosion, it normally has a shelf life of up to two years. Sold in five-gallon containers
• Provides extra durability as it is the strongest and thickest undercoating available

Cons:

• It takes time to harden and so requires more cure time than the other three types
• Unlike the other three, it is also, not paintable as such, not very aesthetically suitable for standard vehicles
• For best used only for the undercarriages of utility vehicles and trucks
• The only type of undercoating with a limited warranty

Water-based Undercoating:

Water-based undercoating is a protective layer that helps the car to stay protected from harsh weather conditions. It is made from an advanced polymer that is non-toxic and environmentally friendly. The product can be applied to any surface, including metal, plastic, rubber, and glass. It will keep your car protected from rust, salt, and moisture.

Pros:

• Thin-set, it takes a short time to dry
• Can be done at home

Cons:

• It requires frequent repetition as it’s not very durable
• It cannot repel ice and water like petroleum-based undercoating

Petroleum-Based Undercoating:

Petroleum-based undercoating is a heavy, viscous oil-based liquid product that provides an effective barrier against moisture and corrosion. The liquid dries and hardens to provide tough, durable, and long-lasting protection against moisture and corrosion. This product is typically applied to the undercarriage of automobiles, trucks, and other vehicles.

Pros:

• Has greater deflective abilities for road salts and grime
• Repels ice and water because of its petroleum base

Cons:

• Requires annual replacement