Fluid Film and Its Role in Corrosion Protection and Lubrication

[MikePhua]

The Origins and Composition of Fluid Film
Fluid Film is a lanolin-based protective coating originally developed for the maritime industry in the mid-20th century. Its roots trace back to shipyards and naval maintenance, where saltwater corrosion posed a constant threat to steel hulls and mechanical components. Unlike petroleum-based rust inhibitors, Fluid Film uses wool wax (lanolin) as its primary active ingredient, offering natural water displacement and long-lasting adhesion to metal surfaces.
Manufactured by Eureka Chemical Company since the 1940s, Fluid Film has expanded into automotive, agricultural, aviation, and heavy equipment sectors. Its non-toxic, non-drying formula makes it suitable for both indoor and outdoor use, and it’s now available in aerosol cans, bulk liquid, and brush-on gel formats.
Terminology Note

• Lanolin: A waxy substance derived from sheep’s wool, known for its moisture-repelling and lubricating properties.
  
• Penetrant: A chemical that seeps into tight spaces to loosen rusted or seized components.
  
• Undercoating: A protective layer applied to the underside of vehicles or machinery to prevent rust and abrasion.
  
• Dielectric: A material that resists electrical conductivity, useful for protecting electrical connections.
  

Applications in Heavy Equipment and Machinery
Fluid Film is widely used in construction, mining, and agricultural equipment to prevent rust and reduce wear. Common applications include:

• Coating hydraulic cylinder rods to prevent pitting
  
• Protecting battery terminals and wiring harnesses from corrosion
  
• Lubricating pivot pins, bushings, and linkages
  
• Sealing exposed metal surfaces during seasonal storage
  
• Undercoating skid steer frames, loader arms, and trailer decks
  

A contractor in Alberta applies Fluid Film to the quick coupler pins on his excavators before winter. The lanolin-based coating prevents moisture intrusion and keeps the pins from seizing, even after weeks of snow exposure.
Performance Characteristics and Limitations
Fluid Film offers several advantages:

• Displaces water and prevents oxygen contact with metal
  
• Does not evaporate or dry out over time
  
• Resists salt spray and road chemicals
  
• Safe on rubber, plastic, and painted surfaces
  
• Non-conductive, making it ideal for electrical terminals
  

However, it also has limitations:

• Not suitable for high-speed bearings or precision lubrication
  
• Can attract dust and dirt in dry environments
  
• Requires reapplication in high-abrasion zones
  
• May soften certain sealants or adhesives over time
  

In a fleet maintenance study, machines treated with Fluid Film showed 60% less rust formation on hydraulic fittings compared to untreated units over a six-month period in coastal conditions.
Application Techniques and Coverage Tips
To apply Fluid Film effectively:

• Clean the surface of loose rust, dirt, and oil
  
• Use aerosol cans for small components and tight spaces
  
• Brush or spray bulk liquid for large surfaces
  
• Reapply every 6–12 months depending on exposure
  
• Avoid applying to brake rotors, belts, or friction surfaces
  

Coverage estimates:

• One gallon covers approximately 1,600 square feet
  
• Aerosol cans offer targeted application for up to 20 square feet per can
  

A technician in Georgia uses a pump sprayer to coat the undercarriage of compact track loaders before rainy season. He reports reduced rust and easier cleanup after mud exposure.
Environmental and Safety Considerations
Fluid Film is biodegradable and free of solvents, making it safer than many petroleum-based alternatives. It does not contain chlorinated hydrocarbons or heavy metals, and it’s approved for use in food-grade environments under certain conditions.
Safety guidelines:

• Use in well-ventilated areas
  
• Wear gloves during prolonged application
  
• Store away from open flame or high heat
  
• Dispose of rags and containers according to local regulations
  

A municipal fleet in Maine switched to Fluid Film for snowplow undercoating after concerns about VOC emissions from traditional asphalt-based coatings. The change reduced environmental impact and improved service intervals.
Operator Stories and Field Wisdom
A farmer in New Zealand coats his hay baler chains with Fluid Film before winter storage. When spring arrives, the chains are rust-free and ready to run without additional lubrication.
Meanwhile, a marine mechanic in Florida uses Fluid Film to protect outboard motor mounts and steering linkages. He notes that even after saltwater immersion, the coated parts remain corrosion-free and easy to service.
Conclusion
Fluid Film is more than a rust inhibitor—it’s a versatile protective agent that blends natural chemistry with industrial durability. From hydraulic fittings to electrical terminals, its lanolin-based formula offers long-lasting defense against moisture, salt, and abrasion. While not a universal lubricant, it excels in environments where corrosion is the enemy and simplicity is key. In the world of heavy equipment, Fluid Film earns its place not just as a product, but as a preventive strategy.