LGB conductive grease is not conductive at all.... they call it conductive because keeping moisture and dirt out of rail joiners kept them conductive...any lithium grease will do as well. I think the LGB stuff might have graphite in it.
The Aristocraft stuff is called Electralube, and is slightly conductive. It will also destroy certain plastics, see the aristo forum for this... i.e. don't use it where it can touch plastic.
Look at that aero-car NG gel lube on my site, it's great stuff, clings like a gel, lubes like an oil under pressure.