Hey Guys I just wanted to post this as the post started by shaun100 has closed.
In the last two weeks I have also had exactly the same problem with rusty water spraying out the rubber stopper over the paint work. I don't usually walk around to the passanger side where the problem is and had quite a bit of spray there.
When I pulled out the rubber stopper rusty water under pressure squirted out. It looks like the pictures already posted.
I was pulling the roof rack off to be ready to fit to a new latter model patrol that I have arriving next week.
The roof rack was purchased December 2012 so is only about 10 months old. I am desperately trying to remember where I put the receipt so I can do something about it.
I wanted to get this post up so the anyone who has one can check theirs before we have more damaged paintwork around the place.
It is a full length steel rack.
Hope this is useful to someone.
Cheers
Dan