Protect Your Car from Rust This Spring

Applying a rust inhibitor can extend the life of your vehicle after a harsh winter.

Published on Mar. 8, 2026

As winter comes to an end, it's important to protect your car from the corrosive effects of road salt and moisture. Applying a rust inhibitor spray can create a protective barrier against rust and corrosion, especially on vulnerable components like brake lines, suspension parts, and the vehicle's undercarriage. Experts recommend thoroughly cleaning the underside of your car before applying the rust inhibitor for best results.

Why it matters

Road salt, moisture, and oxygen can accelerate corrosion and rust, weakening critical components over time. Rust not only hurts a car's resale value, but it can also shorten the lifespan of important parts and make future repairs much more difficult. Applying a rust inhibitor is a simple and cost-effective way to extend the life of your vehicle.

The details

Rust inhibitor products like lanolin-based sprays, wax coatings, and corrosion-inhibiting oils create a protective barrier between the metal and the environment. By sealing out moisture and salt residue, these treatments dramatically slow the corrosion process. Enthusiasts often apply rust inhibitors annually, especially before winter, but spring is also an ideal time after thoroughly cleaning away the season's salt buildup.

  • As winter comes to an end, many drivers turn their attention to spring car-cleaning rituals.

The players

Fluid Film

A lanolin-based rust and corrosion inhibitor spray that creates a protective barrier against moisture and salt.

Justin Helton

An assistant commerce editor at Road & Track who specializes in automotive enthusiast content.

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What they’re saying

“A single can of rust inhibitor rarely suffices. Multiple cans ensure full coverage, reaching every seam and panel to lock out moisture.”

— Justin Helton, Assistant Commerce Editor (Road & Track)

What’s next

Experts recommend thoroughly cleaning the underside of your car with a pressure washer or undercarriage sprayer attachment before applying the rust inhibitor for best results.

The takeaway

Applying a rust inhibitor is a simple and cost-effective way to extend the life of your vehicle by protecting critical components from the corrosive effects of road salt and moisture. This preventative maintenance can pay off in a big way for enthusiasts who plan to keep their cars long-term.