Rust proofing a car in Australia is mostly about stopping salt, sand and stone chips from eating your pride and joy, not chasing miracle gadgets.
Best value is a thorough wash, fix paint chips, then a underbody coating and cavity wax; expect about $400–$1,200 professionally, while DIY sprays are $30–$80 a can.
Electronic rust protection modules? The science for road cars is wobbly—save the cash for decent splash guards and regular freshwater washes after beach runs.
Reapply coatings every 1–3 years, keep drain holes clear, and don’t forget the inside of doors, sills and chassis rails where corrosion loves to start.
If you’re coastal or off-road a lot, it’s worth the spend; otherwise, boring maintenance does 80% of the job for far less dosh.
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