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Nothing Stops it... but...
Once again, I'm sure John's got the best info on this, but i use Techtyl or Septone Anti Corrosion Wax. It doesn't stink like the fish oil and is what the panel beaters use to rust protect cars around here. 4ltrs of it will cost about $50, i just did the underbody of my truck and went through 7 ltrs' of it.. I used it on my last ute which was on the beach all the time and there wasn't a speck of rust on it after 5 years on the beach
Looking into rust prevention for my canter. I have never had underbody treatments on other 4WDs but keen to protect this one. Any suggestions?