Overhead Cap- Exterior?

A bead of silicon?

I don't have a C so I really can't comment. Caulking seems to be the best choice.
However, is it supposed to be sealed? Have you looked at similar units to make sure your rig is not missing something?
How much does it flex while driving? Maybe caulk isn't a good option. JMO

check into "Lord Fusor" they make many automotive type sealers for body panels, or check into an auto body supply shop..

On my class C, there is a rubber gasket between the bunk board and the roof of the chassis cab, which seals it against water getting inside. (The screws that attach the two to each other are driven through the gasket.). You can't really see the gasket from the outside, and from the inside it's normally covered by the headliner trim.

I don't think any caulking etc. is going to make a bit of difference in terms of wind drag, at least that could be measured in terms of fuel mileage. It might very well eliminate some annoying wind noises if they are coming from that area.

Picture might help determine exactly where/what your describing. I seal the cap/molding which covers where the roof/overhead meet with Eternabond. On the bottom side where the overhang connects up with what I suppose is the bottom structure of the overhead bed is covered by a trim piece and I seal that with Proflex.

ksg5000 wrote:
Picture might help determine exactly where/what your describing.

The OOP did post a pic on another website. What he is talking about is the "normal" cab roof of a Class C where it mates to the underside of the cabover bunk. He just doesn't like the way it looks.