Have an outdoor camera system at the office with a yellow and red BNC style connection exposed to the weather on around half the cameras, not caused a problem so far, but not had any real rain for a few weeks. Firm which fitted have gone off the radar, so looking for an easy solution to quickly weatherseal the connections. Someone suggested vaseline and duct tape.

Is there any kind of heat wrap or material to seal easily?

Could try self amalgamating tape.

cheers Nick, picked some of this up from toolstation today