Drip rails, sealer or not?

How does self-leveling work with the A pillar drip rails as well as the rear rails? Wouldnt that stuff just ooze down the channel?

The principals are the same:

[ame="http://www.youtube.com/watch?v=j3sfxHZMeqA"]YouTube- Roof Ditch Self-Leveling Seam Sealer Application - 122EZ[/ame]