Underbody Coating
UNDERBODY COATING
Definition:
Underbody coating is a thick cladding (typically made of rubber) that is placed uniformly to the car’s underside.
It is normally sprayed or painted on when the car is just out of the dealership and is clean.
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.
Purpose of Underbody Coating:
The main purpose of undercoating is to check rust, especially in the body components like frame rails along with other exposed metal parts. Underbody coating can also reduce wear and tear.
But even if you are getting the undercoating applied after a couple of years, it's fine too.
Good undercoating extends the life of your vehicle. 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 aluminum
Thickness of Underbody Coating:
Ziebart undercoating is an asphalt-based substance that's similar to tar once it's dry. It's 10 to 12 mils thick (think 20 sheets of paper) and acts as a barrier against rust and corrosion by sealing out your vehicle's underside to protect it from the harmful elements of the road.
Ranges of Underbody Coating thickness for some cars:
- Tata Indica Vista - 1.5 to 9.0 mm
- Hyundai i10 - 1.0 to 6.0 mm
- Maruti A-Star - 1.5 to 7.0 mm
- Ford Figo - up to 700 micro meter
- Toyota Etios - 32 micro meter
Types of Underbody Coating:
1. 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.
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.
Advantages:
- Easy to apply
- Quickly applied with no fuss
- 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
Examples of rubberized undercoating include 3M 3584 Professional Grade Rubberized Undercoating Rust-Oleum Black Rubberized Undercoating, 3M Body Schutz Rubberized Coating Black, SEM 40523 Low Voc Rubberised Undercoating Aerosol.
2. 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.
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.
During application, they drip or flow into seams and cracks to provide protective properties. They are usually available in a spray gun canister or in an aerosol can and offer at least a base protection in moderately humid climates.
Advantages:
- 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
An example of a Wax/ Paraffin Undercoat is Fluid Film 1, a rust inhibitor, anti-corrosion, and anti-rust undercoat.
3. Polyurethane Underoating:
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.
Advantages:
- 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 fills 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
An example of a Polyutherane undercoat is Adam’s SiO2 Infused Invisible Undercarriage Dressing Spray for car detailing.
Disadvantages:
- For better adherence, needs undercarriage preparation before application
- Requires time-consuming etching with primer to bare metals
4. Asphalt-Based Undercoating:
Unlike the rubberized, wax/paraffin-based, and Polyutherane undercoatings, this type 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.
When it comes to large trucks, heavy machinery, military, and all-terrain vehicles, asphalt-based undercoating provides added durability against rocks, chips, and moisture. It’s usually available from professional service shops.
Advantages:
- 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
Examples of asphalt-based undercoats are Rust Bullet, an automotive inhibitor paint for rust preventive and protective coating. As well as Skyco-Ospho protective coating.
Disadvantages:
- 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
When it comes to DIY (Do it Yourself) undercoating, this type is the most popular. Coming in an aerosol can, it can be purchased from most automotive shops. This product is easy to apply and can be done in a single day.
Advantages:
- Thin-set, it takes a short time to dry
- Can be done at home
Examples of Water-based undercoats are Total Coat Automotive Sprayable Undercoating, Corroseal Water-Based Rust Converter Metal Primer, CRC SP-300 Corrosion Inhibitor, and the Evapo-Rust-Block Water-Based Rust Inhibitor.
Disadvantages:
- It requires frequent repetition as it’s not very durable
- It cannot repel ice and water like petroleum-based undercoating
6. 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.
Petroleum-based undercoating can be purchased from your professional vehicle servicing shops.
Advantages:
- Has greater deflective abilities for road salts and grime
- Repels ice and water because of its petroleum base
Examples of Petroleum-Based undercoating are CRC Heavy Duty Corrosion Inhibitor and the Fluid Film Rust Inhibitor for rust prevention and anti-corrosion.
Disadvantages:
- Requires annual replacement
Types Of Underbody Paint:
A car underbody coating can be factory-applied or aftermarket. Most commonly these coatings are one of three types:
- Resin-based
Polyurethanes and rubber coating are popular because their elastomeric properties provide long-term stone chip damage and corrosion protection as well as sound-deadening effects. These also have the benefit of being suitable for a wide range of substrates and they can be painted over. Can be spray-applied, high build, and is particularly good for areas of possible salt exposure.
- Wax-based
An excellent anti-rust coating suitable for all substrates. The wax is applied soft and cures hard, either by brush or spray, and can be layered thickly. It cannot be top-coated.
- Bitumen-based
These underbody paint systems provide hard-wearing protection against stone chip damage and corrosion. They also have sound-deadening properties. Suitable across many substrates, but cannot be painted over.
Advantages of Underbody Coating:
- Fight 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.
- Absorb 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 of the road noises – at least up to a certain extend
-
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.
- 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 fret about.
CONCLUSION:
The more better coating will get, more better paint absorption. The more better paint absorption will get more corrosion resistance the car will.