Undercoating: Why Asphalt Undercoating Outperforms Oil Fluid-Film

When it comes to protecting the undercarriage of your vehicle, choosing the right type of undercoating is crucial. In the battle of asphalt undercoating versus oil fluid-film, the former often emerges as the superior option for several compelling reasons. Let’s dive into why asphalt undercoating is the better choice for your vehicle’s protection.

What is Undercoating?

Undercoating is the process of applying a protective layer to the undercarriage of a vehicle. This layer guards against elements like moisture, salt, and chemicals that cause rust and corrosion.

Asphalt Undercoating Explained

Asphalt undercoating is a tar-based solution that provides a thick, protective layer over your vehicle’s undercarriage. Its consistency and composition offer superior protection and durability, particularly in harsh weather conditions.

Oil Fluid-Film Undercoating

Oil fluid-film undercoating, while effective in some scenarios, is a lighter, oil-based treatment. It’s known for its penetrative properties but can fall short in longevity and robust protection compared to asphalt-based solutions.

Comparing the Two

Here’s why asphalt undercoating often has the edge over oil fluid-film:

  1. Durability: Asphalt undercoating tends to last longer, requiring fewer applications over time.
  2. Protection Level: The thicker consistency of asphalt provides better protection against harsh elements and abrasive substances.
  3. Resistance to Washing Off: Asphalt undercoating is less likely to wash off under heavy rain or when driving through wet conditions.

Benefits of Asphalt Undercoating

  1. Superior Rust Prevention: Its robust barrier is more effective in preventing rust.
  2. Sound Dampening: Asphalt undercoating can also reduce road noise.
  3. Longevity: It often requires fewer touch-ups than oil-based options.

Application Process

Professional application is recommended for asphalt undercoating. The process involves:

  1. Thoroughly cleaning the undercarriage.
  2. Applying the asphalt-based solution evenly.
  3. Allowing proper time and environment for curing.

Rust on vehicle without undercoating or rustproofing.

Maintenance and Durability

Asphalt undercoating is low maintenance and highly durable. Regular checks during routine vehicle maintenance are sufficient to ensure its integrity. Here at Detail Pro Shop, our undercoating services come with a 7-year warranty, offering free annual touch ups within the warranty period.


While the initial cost might be higher than oil fluid-film, asphalt undercoating’s longevity makes it more cost-effective in the coming years.


Choosing asphalt undercoating for your vehicle’s undercarriage protection offers enhanced durability, superior protection, and greater cost-effectiveness compared to oil fluid-film options. It’s a wise investment for maintaining the longevity and integrity of your vehicle, especially in challenging environments.


Detail Pro Shop packages our Asphalt undercoating with Rustproofing. If you found this article helpful, make sure to check out our article: What is Rustproofing?