You are correct, 100% should not be used on a spark plug.
I've stopped using antiseize on my own vehicles. I use NGKs, they don't recommend it as mentioned earlier, as well as the fact that antiseize can change the heat range of the plug. Champion does have an antiseize for plugs that does not change the heat range.
Someone said it allows to over torque parts in place... Over torque or proper torque? anti seize allows it to spin more freely and give a more accurate torque vs a binding nut/bolt from rust/dirt/debris...
I work in the oilfields on steam lines where temps reach above a 1000 degrees. Anti seize means the difference of coming apart or being cut apart, and when we torque our bolts to 380 ft lbs and 710 ft lbs we torque the bolts with anti sieze applied for a more accurate reading.
I tend to cross rivers etc so I copper coat all of my bolts and use the same torque specs as suggested. I havent had an issue yet. I couldn't believe how much easier my lug nuts we're to remove after I coated them.
I tend to cross rivers etc so I copper coat all of my bolts and use the same torque specs as suggested. I havent had an issue yet. I couldn't believe how much easier my lug nuts we're to remove after I coated them.