Gotta give it to the 540! Out of all my pens the 540 does have a tight seal and I've never had a start up or drying issue even after 2 months of letting it sit.
Unlike my 580 which steadfastly refused to start up even when used an hour earlier. Perhaps it was the change of nib manufacturer and feed but my 580 was one of the most awkward amnd problematic pens I have encountered.
Edited by UK Mike, 05 September 2013 - 10:38.