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Message: [QUOTE="reelrazor, post: 882026, member: 54546"] Okay. The insulator is porcelain/ceramic. You bead or sandblast it and the surface becomes micropitted and holds more crap that is electrically conductive. Look at a new plug with a good magnifier and you will see it is almost a glossy finish, definately smooth. Then beadblast one and look at it with the same magnifier. It will look like a moonscape. Think of an enamel/porcelain bathtub. When new, it is nice and shiny and any deposits can be wiped off, pretty much. After years of using comet, the finish gets dull and it takes no time at all for it to get dingy/dirty. And takes more work to get clean. At least that's my theory. [/QUOTE]