back windows and rust :(

hi everyone

have got a disco1 300tdi and on the top small curved back window around the rubber I have found on both sides rust ... and holes. well I know that it leaks in there and it will need to be cleaned up, removing the rust filling it and then a drop or more of paint to cover it.

just wanted to see if others have had this problem and what they have done.
is it advisable to remove windows and then do the job ? comments suggestions more than welcome?

martin

yes mine has put a pencil through it ,i will remove windows when warmer drier weather comes and cut rust out and weld fresh edge in grind and fill it