In the middle 2000s I spoke to a land rover engineer at a show, I asked him why LR chassis were not galvanised, his reply was cost, at the time I was making up steelwork and sending to be galvanised, it was working out cheaper to galvanise than painting steel. He did not like what I said, and on LR scale the cost would be cheaper still. Proves the paint they used must have been like water, with the way defender rusts.