Underbody Coating

Underbody Coating:

• As the name suggests, undercoating is usually a black, thick liquid that is sprayed on the underside or undercarriage of the car and is used to protect the metal from rust and corrosion.
• It is most commonly applied to vehicles that are used in wet or salty environments since it absorbs most of the moisture, grime, salt, and other chemicals which your motor vehicle comes into contact with on the road.
• Often confused with rust protection, which occurs on the inside of your car, undercoating happens outside, on the underbelly/undercarriage of your car.
• Undercoating can be applied as a liquid, typically sprayed or brushed on, then allowed to dry. It helps to protect the axle, engine, brake system, transmission, exhaust and fuel systems, suspension parts, gas tank, and floorboards.
• Undercoating can be sprayed on any type of car, truck, or SUV. The type one chooses to use is often determined by the level of damage your car has sustained and/or the extent to which you would like to protect its underbelly.
• There are several types of undercoating and their specific brand examples currently available on the market.

Steps to do Undercoating:

• Cleaning- Clean all the surfaces from rust, mud, dust, and oil where the undercoat needs to happen.
• Apply the liquid either by spraying or by brushing over the surface.
• Leave the surface for some time so that the surface gets dry.
• Below image refers to the before and after of undercoating.

Advantages of Undercoating:

• 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.

• 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 to a certain extent.

• Reinforcement:
  

  Undercoating offers 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.

Types of Underbody coating:

1. 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.

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

Disadvantages:

• 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

2. 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.

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.

3. Polyurethane Undercoating

• 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

5. Water-based Undercoating

• Water-based undercoating is a protective layer that helps your car 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. This undercoating provides a protective barrier that lasts for only a year-depending on where you drive your car.
• 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