Underbody Coating

UNDERBODY COATINGS:

Underbody coatings are those which are used to prevent car bodies from rust & corrosion. This underbody coating helps in protection from dust and moisture also some other factors such as poor road conditions, rocks getting thrown from tires, and denting the metal and salt from water during monsoon which play an important role in damaging the underbelly of a car

Difference Between Rust Proofing and Car Underbody Coating?

You would hear these two terms interchangeably; however, they completely differ in their literal meaning. There is no doubt that the purpose of both treatments is to protect your car from developing rust and corrosion in the end.

Underbody Coating

An undercoating is a spraying accessory that protects the vehicle’s body underneath.

Rust Proofing

Applying a protective layer of wax or other coatings on corrosion-prone areas outside the vehicle is rustproofing. This layer is mainly applied to fenders, weld points, upper body panels, and tailgates.

Rust Protection

Rust protection is often confused with rust proofing. However, when a rust inhibitor is applied during the manufacturing process, it is called rust protection. A rust inhibitor blocks the circulation of electrical current stopping rust from developing in the first place.

Such ingredients are applied to almost every vehicle, car, truck, and SUV by mixing into its materials during the manufacturing process. On the other hand, rust-resistant material is also used for manufacturing cars these days.

Modern automotive coating process:

The modern automotive coating consists of five steps:

• Pre-treatment removes and cleans excess metal and forms on appropriate surface structure enabling bonding of a corrosion protection layer.
• The next step is electrodeposition (ED) of the anti-corrosion or rust prevention layer
• A sealer like Poly Vinyl Chloride (PVC) is applied for anti-corrosion, elimination of water leaks, and minimization of chipping and vibrational noise.

A primer is then applied to promote adhesion between the surface and the basecoat, it also imparts a smoother surface for subsequent layers and has anti-chipping properties.

Finally, the topcoats that include a basecoat and clear coat are applied, they provide surface properties that are sought after, including color, appearance, gloss, smoothness, and weather resistance.

Pre-treatment:

The first step in preparing IIW for subsequent coating is the pre-treatment process. Pre-treatment consists of cleaning the body surface to remove remaining oils from the stamping process and welding residues through three primary liquid dip processes of degreasing conditioning and phosphating. The degreasing solution is composed of alkaline salts and surfactants and can include caustic soda, tri-sodium phosphate, and sodium carbonate. The surfactants are types of detergents for emulsifying oils and lubricants on the DIW. UNDERBODY COATINGS:

Underbody coatings are those which are used to prevent car bodies from rust & corrosion. This underbody coating helps in protection from dust and moisture also some other factors such as poor road conditions, rocks getting thrown from tires, and denting the metal and salt from water during monsoon which play an important role in damaging the underbelly of a car

Modern automotive coating process:

The modern automotive coating consists of five steps:

• Pre-treatment removes and cleans excess metal and forms on appropriate surface structure enabling bonding of a corrosion protection layer.
• The next step is electrodeposition (ED) of the anti-corrosion or rust prevention layer
• A sealer like Poly Vinyl Chloride (PVC) is applied for anti-corrosion, elimination of water leaks, and minimization of chipping and vibrational noise.

A primer is then applied to promote adhesion between the surface and the basecoat, it also imparts a smoother surface for subsequent layers and has anti-chipping properties.

Finally, the topcoats that include a basecoat and clear coat are applied, they provide space properties that are sought after, including color, appearance, gloss, smoothness, and weather resistance.

Pre-treatment:

The first step in preparing IIW for subsequent coating is the pre-treatment process. Pre-treatment consists of cleaning the body surface to remove remaining oils from the stamping process and welding residues through three primary liquid dip processes of degreasing conditioning and phosphating. The degreasing solution is composed of alkaline salts and surfactants and can include caustic soda, tri-sodium phosphate, and sodium carbonate. The surfactants are types of detergents for emulsifying oils and lubricants on the BIW.

Electrodeposition (ED):

The metal underbody and frames of automobiles are coated to prevent corrosion, whereas other areas like the roof are not rust-proofed. When not coated to prevent corrosion, the structural metals (or other materials) are primed before applying additional coatings. The ED processes are modified as per the BIW material property. This ED coating provides rust and corrosion protection.

Rust-proof materials: Sealer/PVC

The third step is underbody coating (UBC) and seam sealing using PVC and urethane. 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:

The fourth coating step is the application of a primer surface or simply primer it can be water-borne, solvent-borne, or powder. These primers are used to improve adhesion between the E-coat and topcoat, provide chipping protection, enhance paint appearance and also be environmentally compatible with emission regulations.

Top-coat:

The final step in the Body coating process is to apply the topcoat, which consists of two layers-the basecoats 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 degradation promotes unmatched color retention, and provides a smooth unblemished even finish

How Underbody coating can be applied

You have a few options to select from while considering an undercoating for your vehicle. Obviously, if you are getting it done through an authorized dealer, then you would have no choice as they have their own preferences.

1. Spray

The spray is the most common method used by dealers. The spray consists of a tar-like substance that is applied to the undercarriage. It functions as a barrier for salt, moisture, and oxygen, which causes corrosion. You can also purchase it as a DIY product, but the whole magic lies behind the method of application, so it’s better to do the job with a dealer, especially if you have a new vehicle.

2. Electronic

Removing the electrical current capacity of items underneath the vehicles is another method for applying to undercoats. A weak electric current circulates through the material, reducing the chances of rusting.

For using this method, a DIY solution wouldn’t work; you would need an expert.

3. Drip Oil Spray

If you want to do it yourself, then drip oil spray is the best option. This can be messy but incredibly effective at protecting the undercarriage. It covers every nook and corner of the chassis, forming a robust layer of protection.

Time is the factor where you have to show patience in this method. It takes a long time to dry. In some cases, it drips around 48 hours to a week.

4. Dripless Oil Spray

Coming to the last option, the dripless oil spray. This waxy substance is applied to the body and undercarriage, forming a strong protective layer. It doesn’t take much time to dry; however, the layer can easily wear and tear than the other counter methods.

Advantages of Undercoating:

1. 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.

2. Absorbs Noise

Believe it or not, very thick undercoating can soften the noises that reach the cabin. Since the undercoating is often made up of rubber it absorbs some of the rackets. The occupants of the car could spare themselves from the road noises at least up to a certain extent.

3. Reinforcement

If your car comes with stock underbody coating, using another coating on top of it, is not going to hurt. It will offer additional reinforcement, protecting the underbody from water, road debris, gravel, and small pebbles. There would also be a lesser chance for the factory coat to flake away.

4. Prolong Car's Life

Good undercoating not only defends the underbody from corrosion but also protects the engine and transmission as well! Less rusting coupled with slower wear and tear can surely add years to the lifespan of your vehicle. There would be fewer dents, dings, and scratches on the undercarriage for you to fregbout

Disadvantages of an undercoating

1. It is less helpful if corrosion is already present.

For undercoating to be the most effective, it should be in place before the underbelly of your car begins to rust. If you apply it over corrosion, you will still isolate the metal from further moisture and airflow, which is good, but the existing oxidizing/rusting process will still continue to occur. After the rust is already present, applying an undercoating will slow the continuation of the corrosion process and will make your vehicle look better... until the rust breaks its way through the layer of undercoating you've applied. If you have rust present, it is better to remove the rust and then apply the undercoating.

2. It works best on new cars.

If you've purchased a used vehicle, then the cost of preparing the underbelly for an undercoating might be more than the value of the car. You must remove all the residue from the bottom before it can be applied. Failing to do so will seal in the debris that is present already, which can lead to more problems. The best time to have an undercoating applied is when a vehicle is purchased new because it offers a superior level of protection then.

3. Most vehicles make it five years before corrosion begins to show.

For vehicle owners who purchase something new every 3 to 5 years, then rustproofing may not be a good use of your cash. Although an undercoating does add value to a used car, that only applies when the rustproofing product used provides a transferrable lifetime warranty. Most vehicles that are on the road today are able to make it five years before any corrosion begins to show. It may be 7 to 10 years before the functionality of the vehicle is negatively impacted by the lack of an undercoating. If you wash your vehicle regularly, especially during the winter months, then you might be able to save the time and money required for this service.

4. A third-party undercoating service might void your vehicle's warranty.

Some new cars no longer need the undercoating service provided because the structure of the vehicle has it built-in already. If you hire a third-party provider to apply an undercoating, you could void the corrosion-perforation warranty that is factory-provided. Most vehicles today that leave the factory floor are all provided with included rust proofing.

If you are purchasing a used vehicle, an undercoating to a clean underbelly could extend the life of the vehicle and give it more value. For new vehicle purchases, you should ask the dealer what rustproofing options are included before paying for a separate undercoating option. Ask for documentation of what is provided instead of taking the word of the salesperson or the service personnel.