*** IN STOCK SHIPS TODAY *** MSD's Spark Guard is dielectric grease that solves many common ignition troubles. It stops voltage leaks, eases boot removal, prevents moisture buildup inside the boots, and even helps protect against radio noise (EMI). Spark Guard will not dry or harden up, and will last virtually forever.Sold with detailed use instructions and comes in a handy .50 oz. tube with a closeable lid.