There was a lot of talk back when the 07MY Defender came out about the factory "rust-proofing". That is to say, there was
none. The stuff Land Rover sprayed on the underbody was, by their admission, only to protect the vehicle during transportation and not to be considered as an alternative to full rust proofing. Many people in the UK were complaining how poor the coverage was and that is what Land Rover responded with.
That said, I have not heard of any aftermarket rust-proofing affecting the standard corrosion warranty. There is another thread here discussing that but I can't see how anything a customer does to improve the protection of their vehicle could ever conflict with the standard warranty.
When I had mine done it was straight off the truck and done by one of the usual dealer organised mobs (I think it was Ming - black goo, really messy). The only rule then was that the vehicle had to have never been on road (or off for that matter). They wanted it straight off the flatbed or insisted on doing a full underbody steam clean. Having said that, there is just no substitute for thorough cleaning and flushing of the chassis rails after any off-road trip. And I honestly don't think any expensive rust-proofing system is still much better than drowning the thing in fish-oil on a regular basis - it just smells less.

Bookmarks