I get this stuff at Autozone, its a waterproofing sealant and di-electric used to keep water/oil out of electrical connections and insulate them. Its a clear gel, comes in a little package about the size of a sugar packet. Usually around the parts counter. Use a small knife blade or something to scrape the track off the plug and squirt enough into the plug boot to seal around it real good when you put it back on the plug. Also keeps the boot from sticking the next time you pull it off. Hope that helps you.
