My own idea was to take the trim off, and if putting it back on, put underseal or something ontop of the paint (which of course would be hidden by the trim) so that any trapped water shouldn't get through to the metal work.
Also I thought replace the pop rivets/screws with plastic screws/nuts so they can't rust either.
That was my idea.
As to evo stick, if you ever wanted to check on the metal again, wouldn't it be alot of hassle getting the trim off again? Evo stick when set right is meant to be very good (though mine all fell off on my other non-vw car

).
Chief