Thanks for the heads up on the rust alert.
I just inspected and repaired my 2004 Coupe and found the seal rail to be rusted. Too my surprise the pass door seal rail was the worst of the two. I removed the one door panel to verify the problem is only external. I found no rust or corrosion in the inner door, this is good news as you can address the problem without removing the door panel.
I removed all the loose rust with an abrasive wheel dried and cleaned the seal rail and applied 2 coats of Locktite Extend Rust Neutralizer. I used a clear lacquer for a top seal. Sprayed the rubber seals with a silicone spray and reinstalled the seals.
I live in Indy and the car is a daily driver which means the car has been introduced to plenty of rain, snow and road salt.