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Oil Undercoating vs. Fluid Film: The Guide to Rust Protection

Introduction: As winter approaches, the battle against rust becomes a top priority for car owners. Salt and moisture on the roads can wreak havoc on your vehicle's undercarriage, leading to costly repairs down the line. Fortunately, there are two popular solutions to combat this problem: Oil Undercoating and Fluid Film. In this blog post, we'll explore the pros and cons of both options to help you make an informed decision.

Oil Undercoating:


  1. Long-Lasting Protection: Oil undercoating forms a durable barrier against moisture, salt, and road debris, providing long-lasting rust protection.

  2. Penetrates Well: It seeps into seams, crevices, and hard-to-reach areas, ensuring comprehensive coverage.

  3. Excellent for Extreme Conditions: Oil undercoating excels in regions with harsh winters and high salt usage, making it a top choice in cold climates.

  4. Minimal Environmental Impact: Some oil undercoating products are eco-friendly, which can be appealing to environmentally-conscious customers.


  1. Messy Application: Applying oil undercoating can be messy and time-consuming, requiring professional expertise to avoid drips and excess application.

  2. Reapplication Needed: Over time, the oil can wear off, necessitating periodic reapplications to maintain protection.

Fluid Film:


  1. Non-Drying Formula: Fluid Film remains semi-liquid, offering continuous protection as it creeps into tight spaces, making it effective over an extended period.

  2. Easy Application: It can be applied more easily and cleanly than oil undercoating, reducing the likelihood of mess during the process.

  3. User-Friendly: Fluid Film can be applied by car owners themselves, which may appeal to DIY enthusiasts.

  4. Less Frequent Reapplication: Due to its non-drying nature, Fluid Film may require less frequent reapplication compared to oil undercoating.


  1. Shorter Lifespan: Fluid Film may not provide the same long-lasting protection as oil undercoating in extremely harsh conditions.

  2. Potential for Dripping: In hot weather, Fluid Film may become more liquid and prone to dripping, which can be messy.

Conclusion: When it comes to protecting your car from winter rust, both Oil Undercoating and Fluid Film offer effective solutions. The choice between them depends on your specific needs, budget, and climate. Oil undercoating excels in extreme conditions but may require more maintenance, while Fluid Film is easier to apply and requires less frequent reapplication. Ultimately, the decision should be based on what works best for your customers and your car repair shop's services.

Come give us a call at Stop & Go Oil Change in Brattleboro and we can tell you what we think is the best way to protect your vehicle from the snow and salt this winter.

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