Sparkplug Thread Lube, from Aircraft Tool Supply

A high-temperature, graphitic lubricant for application to spark plug threads during plug installation. Prevents galling and seizure especially with aluminum threads. Sturdy plastic 4 fl. oz. bottle with brush attached to cap. One bottle provides enough lubricant for up to 200 applications.

Apply anti-seize compound sparingly to the firing end threads, but never to the first thread. Never allow antiseize compound to contaminate electrodes or insulator. This may cause plug misfire. Never apply antiseize to the terminal threads on the shielding barrel end of the plug!