[TowerTalk] sealing goop

[Artmouton]

Any ideas on the better types of sealing goop for parts on towers, etc.

I have an older Yaesu Rotator with the plug for the control cable.  No boot 
available to cover the plug connection.  To much chance of tai tai's and 
mi-mings getting in there (also possibly gremmies) so I want to seal it all 
up.

I want to goop it to keep out water, etc.

Then, after applying goop do I further seal it with electrical tape?

What have we out there?
Tnx & 73,
Art K5FNQ