http://www.ngksparkplugs.com/pdf/tb-...1antisieze.pdf

Now, to let my feeling be known:

I've been building and repairing machinery for over 30 (!) years. I'm a HUGE fan of lubricants for every minute of it. I specialize in UHV systems and ion sources for particle accelerators. Many of these parts get really hot. Some I can't even use antiseize on-they can reach the brazing or break-down point of the constituent materials.
So I find another lube. I keep a jar of grapite and one of Boron Nitride powder in my shop for high temp uses. Spark plugs just don't get hot enough for it. At least the threads.
I apply it using a flux brush in vanishingly small amounts and wipe off 99% of it before insertion.
And I reduce torque by 20%.

I use it on my lug bolts and nuts too. Same whisper amount and wipe off any I can see.

One is only trying to treat the surface. Not use it as caulk.

Or glue.

Here's a chart on temperatures vs. metal temps:

How to tell what temperature a glowing object (metals) might be:

Doesn’t really matter what the emitter is…stainless steel, cast iron, tungsten in your light bulb, the temps are about the same for a given color. Generally accepted colors/temps are:

C F Color

400 752 Red heat, visible in the dark
474 885 Red heat, visible in the twilight
525 975 Red heat, visible in the daylight
581 1077 Red heat, visible in the sunlight
700 1292 Dark red
800 1472 Dull cherry-red
900 1652 Cherry-red
1000 1832 Bright cherry-red
1100 2012 Orange-red

C= Centigrade
F= Farenheit