no air leaks and no water leaks either, but water from condensation in the mornings might be an issue, as I've noticed without the weather strip seal in place, only after I wash the car is there water sitting in the metal channel, but at least now the seal doesn't hold the water in the channel and cause further rust.
Now all I do after a car wash is wipe out the metal channel or blow it out with compressed air, the rust has stopped, but I will be removing the paint in the channel and filling it with a resin and microballoon mix, so that the water has no place to settle.