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Re: What's so special about Silicone dielectric grease?
There's all kinds of grease. Silicone grease is generally stable (doesn't oxidize, doesn't migrate) and SuperLube is simply one good brand that has teflon particles added to it for added lubricity. However, you will see some "liquid" running from SuperLube at times, it may migrate more than the "high dielectric" grades.
IIRC the "Al-Ox-It" type corrosion inhibitors also have some zinc dust in them to help avoid aluminum corrosion, and for general use many of us prefer not to have any metal dust in the non-conductive grease. it may or may not actually matter, from what I've heard.
In dielectric grease, you can pay $2 for 1/8 ounce in the little squeeze-pack designed from ignition points or spark plugs, $4 for 1/2 ounce tube, or $5 for an EIGHT oz. tube sold as "high tmeperature silicone brake grease" which is used in larger quantities on wheel brake components. Yes, you grease brake parts. Really.
You can also buy it as "light bulb grease", very similar product usually designed to make sure it doesn't migrate at all (dripping down bulbs) $3-4 an ounce tube.
There are lots of options, lot of names, product varies a little bit but any of them should work. And as Maine points out, silicone can "contaminate" forever, but in the right place, that's not going to be a problem.
Vaseline will also work, but that does conduct (very slightly) and certainly does migrate as it heats up.
If you think the Ancor stuff (which is a very good grade) is expensive, just look at the brand name "ignition point grease".