What You'll Learn

Undercarriage 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, most blokes spend hours polishing the bonnet but completely ignore the bits that actually keep the car together. I once saw a 3-year-old Hilux that looked mint on top but had a chassis like Swiss cheese because the owner lived in Cronulla and never rinsed the salt off. This checklist is for anyone who wants their rig to last longer than a packet of Tim Tams.

Why Bother?

After 15 years in the trade, I've seen it all. Red dust from a Nullarbor run acts like sandpaper on your seals, and coastal salt spray is basically cancer for metal. I reckon a solid afternoon spent under the car now saves you thousands in welding or 'sorry mate, she's cooked' conversations later.

The Gear You'll Need

What You'll Need

0/8

Pressure washer with an underbody lance — A curved wand is a lifesaver so you aren't crawling in the mud.

Salt neutraliser (like Bowden's Own Salt Shaker) — Vital if you've been near the beach lately.

Heavy duty degreaser — I go for the citrus-based stuff, it's easier on the lungs.

Chassis Lanolin or Wax (e.g., Fluid Film or Woolwax) — My go-to for a long-lasting barrier that won't crack.

Stiff nylon brush — For scrubbing that stubborn red dirt out of the corners.

Safety glasses — Trust me, getting degreaser in your eyes while lying on your back is a bad time.

Axle stands or ramps — Never trust a hydraulic jack alone. I made that mistake once on a Commodore, never again.

Old towels or cardboard — To catch the inevitable drips on your driveway.

While you're here...

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Pre-Start Checklist

What You'll Need

0/4

Engine and exhaust are stone cold — Don't spray cold water on a hot cat converter unless you like expensive noises.

Vehicle is securely on stands — Give it a good shake before you crawl under.

Check for active leaks — Look for oil or coolant drips before you wash the evidence away.

Remove any plastic bash plates — The mud hides behind these. Take 'em off or don't bother starting.

The Process

Tap each step to mark complete

High-Pressure Rinse

Blast every nook and cranny. Focus on the 'mud traps' inside the frame rails and above the fuel tank where salt sits.

Degrease and Scrub

Spray your degreaser or salt neutraliser liberally. Let it dwell for 5-10 mins but don't let it dry. Scrub the heavy build-up.

The Deep Flush

Rinse until the water runs crystal clear. If you've been outback, keep going until the red stops flowing out of the chassis holes.

Dry Time

This is crucial. You can't spray sealant on wet metal. Take the missus' hair dryer or let it bake in the sun for an hour.

Apply Protection

Spray your Lanolin or chassis wax. Get a nice even coat on the rails, suspension components, and floor pans. Avoid the brakes!

Final Inspection Checklist

What You'll Need

0/3

Brake rotors are clean — If you got overspray on them, clean it with brake cleaner immediately.

Drain holes are clear — Make sure your sealant didn't plug up the water drainage holes in the chassis.

Exhaust is clear of overspray — Lanolin smells like a wet sheep when it gets hot on an exhaust pipe.

Watch Out

Don't use 'rubberised' undercoating from a can over existing rust; it just traps the moisture and speeds up the rot. Also, stay away from the alternator and electrical connectors with the high-pressure wand, they don't value a soaking.

Aussie Pro Tip

If you're doing a lot of beach work, I reckon the Bilt Hamber products are top notch, but for most of us, Bowden's or even a light coat of Inox usually does the trick for the casual weekend warrior.

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