lifetime of Tempest massive spark plug

Doesn't happen here.
 

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Were they cleaned with small sand or glass blasting media? Tempest says it is a NO-NO and will cause early failure. Lots of good info in the linked PDF.

EDIT: Tempest allows glass beads, per the aforementioned PDF, but require a minimum size to avoid erosion of the enamel that holds the center electrode.
Never cleaned. The center electrode had a faulty weld.
 
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