Sounds good so far, so long as the signal does, indeed, not get interrupted.
The coaxial cable has two parts:
- ground, or shield (outside, usually a net of finer silvery wires, just under the outer insulation)
- center/conductor in the center of the coaxial, usually coppery-looking.
As for silicone gasketing... that's kind of what you use when you rebuild an engine, to seal the coolant from leaking out, you put a thread of silicone solidifying gasket in the right places before bolting the pieces together. It was just a thought, with regard to the question you asked. A good hardware store, or an automotive supply store, would carry it.
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