XTroll Chassis Guard is a spray-on rust protection for 4WD underbodies that stops and prevents rust from salt water, sand and road grime. It dries to a clear, hard, long-lasting film that creates an impervious barrier, so salt and sand wash off with a hose. One litre covers most 4WD underbodies (two for larger or heavily corroded vehicles, up to 25 m2 on clean surfaces). It suits new and older vehicles and is Australian made.

Beach driving, creek crossings and salted roads attack a 4WD from underneath. Salt water sits in seams and chassis rails and rust starts long before you see it. The XTroll Chassis Guard rust protection spray puts a barrier between your steel and the salt. Because it is sprayed on, it reaches the underbody surfaces a brush can't.

Application is simple. Wash and degrease the underbody, let it dry, and spray evenly across every surface. In addition, a second coat 4-6 hours after the first builds a thicker film. It dries in 6-12 hours per coat; allow 7 days before heavy salt-water exposure. As a result, the film hardens into a clear, durable coating that can last around 12 months between applications.

Aftercare is easier too. Because the XTroll Chassis Guard rust protection spray repels salt and sand, a plain water hose-off after the beach is all it needs - no degreasers or detergents, which would weaken the barrier. It also pairs with XTroll Rust Conqueror: treat any existing rust with Rust Conqueror first, then seal the whole underbody with Chassis Guard.

Use it on:

• New 4WDs before their first beach trip
• Older vehicles with underbody surface rust
• Chassis rails, floor pans, wheel arches and suspension components
• Trailers, boat trailers and camper chassis

One litre does most 4WDs; two litres for bigger or heavily corroded vehicles. Choose the XTroll Chassis Guard rust protection spray to keep salt and rust off your underbody.

The ultimate rust protection spray for your 4WD

XTroll Chassis Guard is the ultimate rust protection spray for your 4WD. Chassis Guard is the go-to underbody spray to stop or prevent salt water and rust from destroying your vehicle. The easy-to-use spray bottle application is perfect for both new and older vehicles, with a long-lasting clear, hard-drying finish.

XTroll Chassis Guard at a glance

• Coverage: 1L covers most 4WD underbodies; 2L for heavily corroded vehicles or larger 4WDs (up to 25 m2 on clean, well-prepared surfaces).
• Drying time: 6-12 hours per coat, depending on conditions.
• Clean up: mineral turps.
• How to apply: spray evenly across all underbody surfaces. When possible, apply a second coat 4-6 hours after the first.

Download the Chassis Guard Application Guide (PDF)