Anti seize is a product that you can get at any auto parts store, it prevents the sticking or "seizing" of the threads caused by teperature changes and the difference in metals when you try to remove your plugs the next time. As a by product, it makes it easier to install plugs by acting as a lube. (lub - e) I always use a small amount of dielectric grease(also available at auto parts stores) on the plug before reattaching the boot. no complaints 5+years.