If we were staying here in Australia we would probably not have worried too much as we would have likely changed the vehicle before it became a problem. But with taking the vehicle to New Zealand which is a much wetter climate the rust would increase more rapidly and we will not do such high kilometers so we will therefore keep the car longer.
It was only surface rust and there were no holes or anything like that so it was just a matter of Hubby grinding back the rust, applying rust converter and repainting.
This is after the rust has been ground off and scrubbed back and rust converter has been applied and left to dry.
Hubby then repainted the entire tray with undercoat/primer.
Then finally the entire tray was repainted.
The rest of the vehicle had no issues so we just need to worry about cleaning it before we move so this investment of