Underbody Coating

Underbody rust-preventive coating

The underbody coating that is most commonly used on cars in India and supplied by companies such as 3M is a thick, rubberized paint that forms a 2-3 mm thick coating all along the underside of the car when sprayed on. You also get a thinner clear coat underbody coating which is like a lacquer that coats the entire underside of the car. Some even inject rust-preventive coating material into crevices such as the bottom of doors and door sills, to protect them from rust.

Some car manufacturers already offer some underbody coating straight out of the factory which is usually sprayed inside the wheel arches and under the floor board of the car.

Here are some benefits of underbody coating

Rust Prevention
Ideally any additional underbody coating should be applied when the car is brand new and clean. Car manufacturers use thick paints and sealants for the underbody, but adding an underbody coat especially in coastal cities is useful. Salt water tends to corrode cars really badly.

On bad roads, flying stones and pebbles can chip off the original underbody coating and leave the metal exposed. Using an aftermarket underbody coating offer extra protection.

Sound insulation

The thicker underbody coatings used on cars also act as effective sound dampeners. They can reduce road noise and tyre noise and make the cabin seem quieter – due to the sound absorptive nature of rubberized paints.

Easy maintenance

A uniform black underbody coating gives a car a clean look. It also makes the car easier to maintain by just hosing the underside down. You can be confident that slush build up won’t lead to rusting easily. Most underbody coats these days come with a five-year warranty, which is the lifetime of such a coating.

Here are some of the downsides to underbody coating:

High cost

Cost of underbody coating has come down, but is still expensive. This is because underbody coating offered by a car dealer is one way in which they make money off the customer.

Risk of damage during application

Care must be taken while applying underbody coating. This thick rubberized paint if not applied properly, can get into moving mechanical parts and cause premature failure – such as into the U-joint or CV joints in a cars propeller shaft or drive shafts. They can also hinder smooth movement of suspension components, if applied incorrectly. And there’s also the risk of overspray on to the car’s paint finish on the lower edges of the car.

Teflon coating

Teflon coating is the generic name given for a clear-coat paint sealant that’s applied to the painted surfaces of the car. It is a brand originally owned by Dupont, but now has become generic to the category of PTFE paint sealants. This protects the car’s painted finish and offers a brilliant shine, keeping the vehicle like new for a long time.

Here are the benefits of Teflon coating:

Minor scratch protection

Teflon is a thick clear coat surface that is very slippery. It protects the cars surface from swirl marks and scratches caused by dust and cleaning with a dirty cloth.

Enhances gloss

Putting a clear coat hard wax or Teflon coating on a car evens out the unevenness in the painted surface by filling up minor pits and cracks. This enhances the reflective capability of the paint, giving the car a high-gloss finish that looks like a mirror.

Here are the downsides of Teflon coating:

Not long-lasting

Teflon coating does not last long enough. The effect can wear off in about six month’s time after which it will need to be redone or you have to switch to a hard-wax polish for the car. The benefits of a hard-wax too are not long-lasting, but can be re-done at a much lower cost.

High cost

The high-cost of Teflon-coating application is another down side. Car dealers often charge high amounts in excess of Rs. 3,000 to coat a car, where most of the cost goes towards the dealer’s profit margin. If you have the time and patience, a good hard wax is a better option for your car.

Tell us if you know of any other pros and cons to underbody coatings and Teflon coatings, so that other CarToq community members can make an informed decision of such services dealers and car accessory shops.

offered by

Benefits of Undercoating

• Save money. It’s expensive to have your car undercoated by a professional since it can cost hundreds of dollars for one session. Moreover, you would also have to wait for a couple of days before the job is done. Instead of spending a fortune on an undercoating service, buy a quick-dry undercoat and do the job yourself.
• Reduce road noise. A vehicle’s undercarriage gets noisier as time goes by due to rust and wear. Most undercoats are formulated to seal all the nooks and crannies on the undercarriage that typically lead to road noise.
• Add an extra layer of protection. An undercoat typically acts as an additional layer of protection from mold, moisture, dust, and rot. It also protects your vehicle from dents, scratches, and paint chips.
• 

Types of Vehicle Undercoating

Rubberized Undercoating

Rubberized undercoating is easy to apply, and generally offers the best protective coating for your car’s undercarriage. It cushions surfaces against moisture, rust, dings, and dents. Rubberized undercoating is safe to use on quarter panels and wheel wells and dries with a soft rubbery finish.

Asphalt-Based Undercoating

Asphalt-based undercoating offers a higher level of protection suitable for large trucks, recreational vehicles, and heavy machinery. It’s formulated with some bits of rubberized material to aid in noise reduction. It offers extra protection against chips and moisture but is not paintable and, therefore, only suitable for undercarriages.

Polyurethane Undercoating

Polyurethane coating is easy to apply and works by sealing up cracks and seams. The compound displaces salt and moisture and protects the unoxidized metal from rust. It’s often sold in canisters that are ready to preload into an application gun. It, however, requires some surface prep work before application, like degreasing, and applying an etching primer to the bare metal.

Wax or Paraffin-Based Undercoating

Wax or paraffin-based undercoating sprays are the cheapest and quickest options available. However, their results don’t last long, and you may have to apply a fresh coat after only a few months. In addition, the wax isn’t very adhesive on a metal surface. Its main advantage is that it seeps quickly into cracks and seams, and offers moderate protective properties against moisture.

Key Features

Volume

Vehicle undercoating products come in volumes from 16 ounces to about 5 gallons. Think of how much undercoat you will use in the current job, the size of your vehicle, and how much you will need to buy in the near future. A 16-ounce bottle is suitable for a small car, but an RV or a truck will need a 1-gallon jug to get the job done.

Shelf Life

Most premium undercoating materials have a shelf life of at least one year after being opened. Others can only last for a few months, then they start to wear off. If you find a fully functional product with a short shelf life, it’s prudent to buy it in small portions. Figuring that you will use the undercoat at least once a year, the shelf life shouldn’t be an issue if you go for the right portions.

Formulation

The formulation you choose depends on your budget and how long you want the coat to last. Rubberized and asphalt-based undercoats are more expensive, but a single coating job can last up to a year or longer depending on the environmental conditions. Cheaper options like paraffin-based formulations last for only a few months, and you may not be able to stand the smell.

ADVANTAGES;

• It provides a layer of protection against corrosion.

When an undercoating is properly applied to a vehicle, then you'll be providing the underbelly with a layer of protection against rust and corrosion. Instead of contacting the metal components of the vehicle, the debris encounters the undercoating, which then proactively repels the dangerous items away. Although an undercoating will eventually wear out, it can provide years of protection against premature corrosion.

• It will extend the life of your vehicle.

A proper undercoating extends the life of your vehicle because of its rust-stopping power. Corrosion does more than affect the integrity of the metals in your vehicle. It can get into your metal wires and cables, affecting any component which is comprised of steel or aluminium. Even your transmission and engine have exposure to rust when there isn't a vehicle undercoating applied.

• It can beapplied to damaged areas.

Over time, the underbelly of your vehicle is going to develop nicks, chips, and scratches because of the debris you encounter while driving. Unlike older forms of undercoating, which included the use of asphalt and animal fat, modern products provide a real layer of protection because it can morph into the various areas of small damage.

A modern undercoating is usually wax based, which creates a living barrier that your vehicle can use to promote a self-healing experience.

• It can be self-applied.

Rustproofing works best when you have this service professionally applied to your vehicle. If money is tight, however, and you have some basic car maintenance skills, then you can do the work yourself.

If this service is applied at the dealership, it may cost up to $1,500, depending on the make and model of your vehicle. Some dealers include it in a package of services that are priced even higher. When you do the job yourself, then the cost can be less than $100 for cars and under $150 for trucks and SUVs.

Just keep in mind that you're going to be creating a bit of a mess while applying a DIY undercoat.

• There are multiple undercoating methods which can be used.

There are four different undercoating methods that are commonly used on vehicles which require this service. The electronic method is used when rust is present to stop its corrosive effect, which is a method that receives mixed reviews. A standard undercoating method applies a tar-like substance to the exposed components of the vehicle underbelly. A dripless oil spray applies a waxy substance that fills in the entire body of the vehicle, which hardens when it dries.

Then there is the drip oil method, which may cause dripping for up to 48 hours when applied. From a cost perspective, it is this final option that is most often applied at the dealership.

• The service might help with the cost of your insurance.

Vehicular insurance is based on risk. If you reduce the risks of a claim by giving your vehicle a proactive service, of which an undercoating applies, then it may lower your overall premiums. States which see high levels of corrosiveness, such as Hawaii, typically see the steepest discounts with this advantage. Northern and coastal states in the U.S. might also see this benefit.

Although the premium decrease won't offset the cost of the service, a discount of 3% to 7% may be available for some owners.

• It may help to reduce interior noise.

When you're driving, the sounds of the road can be soothing if they aren't too loud. For lightweight vehicles, the noise pollution can be overwhelming to the driver in some situations. Applying a layer of undercoating creates a barrier against the sound, which creates an interior that is quieter. After the service is performed, many drivers notice that audio levels are noticeably lower inside their vehicle.

DISADVANTAGES;

• It won't do anything about the corrosion which is already present.

For an undercoating to be effective, it must be in place before the underbelly of your car begins to rust. If you apply it over corrosion, you won't be making an improvement. It will look better„. until the rust breaks its way through the layer of undercoating you've applied. If you have rust present, then it must be removed, with the metal repaired, before the undercoating is applied for best results.

• 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.

• 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.

• 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.

Many dealers have language in their terms and conditions that only written agreements are binding.

• It adds weight to the vehicle.

Although the amount of weight added to a vehicle with an undercoating is minimal (between 10 to 20 pounds for most vehicles), there is an element of fuel economy to consider. When your vehicle weighs more, the distance you can travel on a single tank of fuel is reduced. The undercoating might reduce your efficiency by up to one mile per gallon, which creates an additional fuel cost over time that is worth considering.

• An undercoating is not impervious to damage.

An undercoating can provide a hardened layer of protection against dirt and debris that may cause corrosion. Depending on where you drive, however, the lifespan of this product may be minimal. If you drive your vehicle on gravel roads or dirty areas frequently, you reduce the integrity of the protective layer.

You might find that your undercoating begins to chip off in as little as 25,000 miles because of this issue. Driving in a salty environment is not the only threat to the integrity of this product.

• It must be reapplied every 3 to 5 years for best results.

The only way for an undercoating to provide ongoing protection for your vehicle is to have the service repeated frequently. Most owners can have a new layer applied in about 5 years without worrying about their underbelly being compromised. In salty or destructive environments, however, you may need to have a new undercoating applied every 3 years for best results.

The pros and cons of a vehicle undercoating offer a complex opportunity to protect some new and used cars, but not all new vehicles require it. You must perform your own due diligence on a vehicle you're wanting to purchase to decide if this service is right for you. And, if cost is an issue, it is possible to apply your own undercoating, though such an action might void an active warranty.

• Protects Against Rust & Corrosion

The primary objective of getting underbody coating done is preventing metal components that are exposed on the bottom side of the car to damage from corrosion. You can shut out the Adverse effects of corrosion on your car by simply applying a rubberised anti-rust coating all over the belly of your car.

Out of all the things you need to do to prep your ride for the monsoon, Protecting the underbelly of the car should be your top priority. Especially during monsoon 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.

Hence, we bring to you some of the factors that make Underbody Anti-Rust Coating essential before stepping into the monsoon season.

APPLICATION PROCEDURE OF UNDERBODY COATING;

1. Lift up the vehicle, take off the wheel and plastic wheel covering.
2. Thoroughly clean the under body of the vehicle by high pressure water.
3. Blasting with compressed air could accelerate the drying.
4. Mask off the adjacent areas and parts with paper where not allowed to spray, such as exhausting pipe, brake system, engine, paint surface and etc.
5. Shake the can approx. 40 times before use, connect the can with spray gun.
6. Spray at room temperature and from a distance of approx. 25 cm in an X motion to build up a continuous coat Do not spray on parts of the brake, engine or exhaust system.
7. Apply this product until the desired layer thickness is reached. If a thick layer is required, let layers dry in between.
8. After each use, clean the spray by flushing with suitable solvent.
9. After tough free, remove all the mask paper, re install all the parts.
10. In case the under-body coating is sprayed to unwanted areas, clean it before drying.

NEED OF UNDERBODY COATING ON A CAR;

1. A must-have if you live in coastal areas

Vehicles in the coastal areas are much more prone to corrosion than in any other region. The content of salt in the water floating around during the monsoon season is way too high. Adding to this is the humidity in such areas and these elements further speed up the process of corrosion. Hence getting your car done right with a nice underbody coat job is of utmost importance for people living that beach life.

2. Or if you live near un-paved/muddy roads

If you live in areas having large sections of unpaved roads, then monsoon is just going to make things worse. The sand is going to mix with the water and all that muck will get stuck to your car's belly while you tread over such a course. This makes your car's underbody more vulnerable to damage and a nice and thick coating will surely help.

3. It also affects your car resale value

All that damage due to corrosion, if left unattended could lead to some permanent damage, which will cost you in terms of rapid depreciation in your car's resale value. This will make it almost impossible for your car to pass a strict inspection when you put it up for sale. Hence, regular checks of your car's underbody condition is the key to maintaining its value.

Other Considerations

• Functionality: The undercoating spray should be able to at least prevent rust and corrosion on the metal surface. It should also be paintable, have sound deadening properties, have quick drying time, and improve the aesthetics of the sprayed surface.
• Filling Power: The filling power is a measure of the undercoat’s ability to seep through cracks and holes, to smoothen out irregular surfaces. An even surface sets a great base for the topcoat paint and makes the vehicle's body look more appealing.