I was thinking of the grease used on computer circuit board edge card connectors. It is slightly conductive to electricity. That stuff is VERY expensive and is not meant to take any amount of heat. The thought crossed my mind that maybe Jim was referring to anti-oxidant joint compound used on aluminum wiring. Some electricians call this stuff dialectric grease too. This stuff may keep the contacts from corroding, but otherwise I think it would make a royal mess. The grease used on spark plugs is basically a high temperature insulating silicone grease. When that stuff is used inside of a spark plug boot, it is pretty well sealed to the elements, so it won't pick up much dirt. But used in the open air such as on a fuse block, I bet it would pick up dust and get messy. Walt Tampa, FL