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Mike i had the same concerns, but they write on their Homepage jb weld is an Isolator https://www.jbweld.com/pages/faqsSo i gave it a try on my first set of plugs. There was no Problem withe the jb weld but with the corian that was eaten away by the sparks.Nevertheless i will Keep the jbWeld in the smal chamber between the the two Isolator parts. Just to be sure.Michael