Mercury Quicksilver Dielectric Compound (227 g) is a genuine OEM, silicone-based protective compound specifically formulated to seal, insulate, and protect electrical connections in harsh marine environments where moisture, salt air, vibration, and temperature extremes can cause corrosion or electrical failure. This non-conductive compound displaces moisture and forms a durable protective barrier, helping maintain reliable electrical performance without interfering with signal transmission or connector fit.
On Mercury outboards, Dielectric Compound is commonly used on spark plug boots, ignition coil connections, engine harness plugs, sensor connectors, battery terminals (light coating), fuse blocks, and trim/tilt electrical connectors, where water intrusion and corrosion are common causes of misfires and intermittent faults. On MerCruiser sterndrives and inboard engines, it is specified for engine wiring harness connectors, ECU plugs, distributor caps, ignition modules, gauge connectors, cannon plugs, and trailer plug connections, especially in bilge and transom areas exposed to moisture. Using Mercury Quicksilver Dielectric Compound is important because it prevents corrosion, reduces electrical resistance caused by oxidation, improves long-term connection reliability, and helps avoid hard-to-diagnose electrical issues, all while meeting Mercury Marine’s OEM service and warranty standards.
Note: Always verify the compatibility of replacement parts with your specific engine model and serial number. For assistance, consult your Mercury Marine dealer or refer to the Mercury Parts Catalog.