Underbody Coating

Underbody coating is usually a dense cladding (often based on rubber) applied uniformly to the undercarriage of the automobile. Basically, undercoating refers to the vehicle exterior while rust-proofing refers to the inside.

Different Types of Vehicle Undercoating:

Having undercoating professionally applied to your vehicle can be expensive, but fortunately, if your budget is tight, you can do it yourself for a fraction of the price. Here are some of the various types of undercoating available.

1. Rubberized Undercoating

Rubberized vehicle undercoating is easy to apply and offers sound cushioning as well as protection from dust, moisture, and dings or dents.

In addition to your undercarriage, rubberized undercoating is also safe to use on wheel wells and quarter panels, and dries to a soft rubbery finish that prevents further rust, damage, or moisture seeps. The coating can be painted over and, if necessary for bodywork, can be easily removed with an undercoating removal spray.

Overall, the rubberized coating is generally the best option for protecting your vehicle's undercarriage, as it provides the simplest and best protective measures against rust and moisture.

2. Polyurethane Undercoating

The other option for undercoating your vehicle is to use a polyurethane-based sealant. This type of vehicle undercoating is a little bit quicker and easier to apply.

Oftentimes, polyurethane undercoating will come in canisters ready to preload into an application gun. This type of sealant works by seeping into all cracks and seams, displacing salt and moisture and oozing around rusty areas to bond with and protect the unoxidized metal. It also sands quickly in case you'll need to perform bodywork and can be painted over.

On the flip side, this type of car undercoating generally requires a little bit more surface prep work before applying -- sanding and applying an etching primer to bare metals before using are generally recommended.

3. Wax or Paraffin-Based Undercoatings

A paraffin-based undercoating will be the cheapest and quickest option available with which to protect the undercarriage of your vehicle. However, keep in mind that it will wear off quicker than other types of undercoating and will need to be stripped and reapplied at least once every year.

Wax-based undercoatings never truly harden. 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.

4. Asphalt-Based Undercoating

For standard vehicles, any of the aforementioned types of undercoating will provide sufficient protection. For large trucks and heavy machinery, asphalt-based undercoating provides a bit of extra durability against rocks, chips, and moisture.

Asphalt-based undercoating generally contains a little bit of rubberized material that sets up firmly and also helps soften noise. Generally sold in five-gallon containers, this type of undercoating also needs more cure time than the other three, and is NOT paintable, making it best to use only for undercarriages

Pros:

1) Protection Against Corrosion And Rust

Undercoating offers a layer of protection against corrosion and rust. Any debris will be repelled by the undercoating.

2) Extend The Life Of Your Vehicle

It will extend the life of your car. Undercoating stops rust.

Corrosion isn’t just about causing an issue with the metal under your car but it can also get into cables and wires – in fact, anything made of aluminium or steel can be affected including the engine and transmission.

3) Cover Small Damages

You can undercoat damaged parts of the car such as scratches, chips and nicks caused by debris flying up as you drive.

Modern undercoating can cover small areas of damage.

6) Reduce Noise Inside Your Car

Undercoating your vehicle can reduce noise inside the car while you’re driving.

The coating creates a sound barrier meaning the interior of the car will be quieter.

Cons:

1) It’s Not Effective On Cars With Corrosion

2) It Makes Your Vehicle Heavier

3) It Can Be Expensive

Reapply it every 3 to 5 years. This is the only way to ensure your vehicle is protected properly.