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Maintenance Basics intermediate 3 min read

Keeping the Rust Off: Your Underbody Protection Checklist (Mar 2026)

Most car owners make this harder than it needs to be. Here's the straightforward approach that actually works—no fluff, no upselling.

Don't let the salt and red dust eat your chassis from the inside out. This checklist covers exactly what you need to inspect, clean, and protect to keep your rig rust-free for years.

MT
Mick Thompson Senior Detailing Editor
| Updated: 17 March 2026
What You'll Learn
Keeping the Rust Off: Your Underbody Protection Checklist (Mar 2026)

Aussie Conditions

Australian conditions are tougher than most—intense UV, red dust, coastal salt, and 40°C summers. European car care advice often doesn't cut it here.
Quick Summary

Look, I've seen too many good 70 Series and Hiluxes ruined by salt spray because the owner thought a quick hose down at the local car wash was enough. Truth is, if you're hitting the beach or living near the coast, you need a proper plan. This guide is a no-nonsense list of what I use in my shop to stop the rot before it starts.

01

The Essential Gear

What You'll Need

0/8
Pressure washer with an underbody attachment — Don't bother with just a garden hose; it doesn't have the poke to shift caked-on mud.
Salt neutraliser (like Salt-Away or Bowden's Own) — Essential if you've been on the beach. Water alone won't kill the salt crystals.
Lanolin or Cavity Wax spray — I reckon Lanotec or Inox MX4 is the way to go. Smells like a wet sheep, but it works.
Stiff nylon brush — For scrubbing that stubborn red dust out of the corners.
Safety glasses and a mask — Trust me, you don't want lanolin or 10-year-old grit in your eyes when you're under there.
Degreaser — To clean up any old oil leaks before you seal everything in.
Torches or a good work light — You can't protect what you can't see.
Wire brush or sandpaper — Only needed if you've already got surface rust to clean up first.

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02

Pre-Start Inspection

What You'll Need

0/4
Check for existing flakey rust — If it clicks when you poke it, you've got work to do.
Identify drain holes — Make sure the chassis rail drains aren't blocked by mud or red dust.
Look for oil leaks — I once sprayed a whole underbody only to find a diff leak a week later. Messy job to fix.
Check rubber boots and seals — Ensure CV boots aren't torn before you start spraying chemicals around.
03

The Protection Process

Tap each step to mark complete
01

Deep Clean

Blat the underbody with high pressure. Use the salt neutraliser if you've been coastal. Get into every nook and cranny of the chassis rails.

02

Degrease and Scrub

Hit the greasy bits with degreaser and a brush. You want the protection to stick to the metal, not the grime.

03

Dry Time

This is crucial. Give it a few hours in the sun or use a leaf blower. Never spray sealant over trapped water; that's just asking for trouble.

04

Surface Prep

If you see brown surface rust, hit it with a wire brush and some rust converter. (Made this mistake on a black Commodore, never again).

05

Apply Protection

Chuck a coat of lanolin or wax over everything. Focus on weld seams, bolts, and inside the chassis rails using an extension wand.

06

Wipe Excess

Give your exhaust and brake rotors a quick wipe with a clean rag if you got any overspray on them. They'll stink otherwise.

04

Final Inspection Checklist

What You'll Need

0/4
Exhaust check — Ensure no thick coating is on the cat converter or muffler (fire hazard).
Brake surfaces — Double check the rotors are clean. Use brake cleaner if you were messy.
Drain holes — Confirm they are still open and not plugged by the protective wax.
Uniform coverage — Look for any 'dry' spots you missed behind the fuel tank or spare tyre.

Watch Out

Don't go spraying rubber bushings or radiator hoses with petroleum-based stuff, as it can perish the rubber over time. Also, keep the spray away from your brakes, I reckon that goes without saying, but you'd be surprised what I've seen in the shop.

Expert Tip

If you're heading to the Simpson or doing a big desert trip, do this *before* you go. The red dust sticks to the lanolin and creates a secondary barrier. It looks ugly as sin, but it stops the sand from sandblasting your chassis.

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