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Nickel anti-sieze may not be sitting on the shelves at your local parts store, but I bet they can get it by the next day. That is the case for Oreillys.
According to the loctite web site, Heat range for copper is 980*C/1796*F. For the aluminum stuff, it's 900*C/1652*F.
I've tried both. Don't see that there's much of a differance.
They are both fine for spark plug threads but not for high temp applications (2,400 - 2,600 degrees) like the grounding shield. That is where the high temp nickle anti-seize is required.