NAPA has "waterproof" grease, it is red in color. Pennzoil makes a white grease;
http://www.pzlqs.com/Tech/Pdsheet/Do...eGrease705.PDF
Spray Lithium grease is usually used for corrosion protection.

You need to be very careful if using any actual "Grease" on low voltage electrical connections. Many types of waterproof "grease" contain enough mineral materials to conduct electricity. 5 volt signal circuits don't like losing any voltage across circuits( ie inside connectors ) so only a high quality dielectric compound should be used.

Di-electric grease by definition is non-conducting, corrosion makes for poor conduction, put the two together and you may compound a problem, I have seen that happen on race cars.


Exactly, regular grease, even waterproof is not di-electric(non-conducting) whilst it is great for battery terminals etc. However di-electric grease is great for waterproofing a connection and sealing it from the air, thereby stopping oxidation and corrosion where it matters.

I've been using Corrosion Block Dielectric grease for several years on my boat with no problems. I figure it helps fight any corrosion that might already be on a connection.

so I shouldnt have put di-electric grease in my spark plug boots?

Isn't dielectric grease just silicone grease? That's what the 3M stuff is that I have.

Michael

It is a good place for it, stops water getting in and starting corrosion.

It is not di-electric unless it says it is.

Okay so what is a good off-the-shelf dielectric grease brand that may come in a spray can or something besides those little squeeze tubes? I'm looking for quantity & good shelf-life in my shed when not in use.

Dow Corning. we use it on gas turbine electrical connections
Available in cans or 8 oz tubes from MSC