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Nonconductive YES or in other words, conductive: NO--not look good for spark plugs...
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Where did you read that non-conductive grease or paste will damage spark plugs?
Any type of grease or paste could foul a spark plug if it gets onto the electrodes.
Properly tightened spark plugs will be well grounded no matter what type of grease is used on the threads.
Conductive grease or paste contains metal which might not be good for engines if it gets inside of a cylinder.
In the latest issue of Sport Aviation, Brian and Carol Carpenter discuss Rotax spark plugs including how to apply thermal paste sparingly to spark plug threads.