Caulking a rubrail

[plusone876]

So I recently pulled my rubrail, epoxied the hull/cap joint and all holes in the cap, sealed the hull/cap joint with 5200, and ran a bead of 5200 behind the rubrail. My questions is that if I have a few gaps in the rubrail to fiberglass area (above and below the rubrail), should I fill them in with a sealant? If so, what kind?

As of now, water should not be able to pass from the top of the rubrail to the bottom of the rubrail and I want to allow for any water that enters the rubrail from the deck or from beneath to have a way to escape.

Thoughts, suggestions?