Dow Corning now Dupont Molykote Electrical Sealant Compound
Specially formulated Grease used by Electronic and Marine Engineers.
Part No : DC 4    
100gram.  Tube
DC 4 is a smooth, Silicone, Grease-like material containing an Inert Silica Filler
in combination with selected Polydimethyl Silicone Fluids.
It has excellent Dielectric properties and is also highly water repellent .
It can be used as a filling or a coating to exclude moisture or prevent electropic leakage
under damp conditions in Electronic Equipment. 
Also very handy to use as a lubricant when working with wiring.

Supplied in a 100 gram. tube
Low Volatility
Moisture Resistant
Good Thermal Oxidation and Chemical Stability.
Meets Requirements of SAE  AS  8660