Mission Automotive Silicone Dielectric Grease 8 oz — Clear Waterproof Paste for Spark Plugs & Connectors

Mission Automotive Silicone Dielectric Grease Paste is a clear, waterproof silicone lubricant designed to protect electrical connectors and spark plugs from moisture, corrosion, and arcing in automotive and marine applications.

This 8-ounce dielectric grease comes as a thick, clear-to-milky silicone paste formulated to seal, lubricate, and preserve electrical contacts and nearby rubber components. It resists temperature extremes and environmental exposure, making it a practical maintenance item for car, truck, motorcycle, and boat owners. The container includes an applicator brush in the lid for precise placement and minimal waste.

How does this grease protect electrical connectors?

The silicone dielectric paste forms a waterproof barrier that blocks moisture and reduces the chance of oxidation at connector interfaces. Because it is non-conductive, the grease prevents voltage leaks around housings without interfering with signal transfer when applied correctly to mating surfaces. Its thick consistency also fills small gaps and repels contaminants that cause poor connections.

• Seals out water, salt, and road contaminants from plugs and harnesses
• Resists oxidation and corrosion on metal terminals
• Non-conductive silicone prevents arcing when applied to connector boots
• Brush applicator enables controlled, mess-free coverage

Can I use this paste on spark plugs and ignition components?

Yes — it’s commonly used to protect spark plug boots and connectors from moisture and to ease future removal. Applied around the spark plug boot or distributor cap and on rubber seals, the grease helps preserve rubber components and prevents moisture intrusion that can lead to misfires or corrosion-related failures.

• Use sparingly on spark plug boots and coil pack seals
• Helps prevent seizure and facilitates easier maintenance
• Protects rubber gaskets and weatherstripping from drying and cracking
• Non-reactive formula safe for common ignition materials

What other automotive and marine jobs is this dielectric grease good for?

This silicone paste is versatile across electrical, mechanical, and sealing tasks. It’s useful for lubricating brake caliper pins, preserving rubber door seals, protecting trailer wiring plugs, and maintaining marine electrical connections exposed to saltwater. The product excels where moisture exclusion and long-term stability are priorities.

• Lubricates brake caliper pins to reduce squeal and binding
• Preserves weatherstripping and window seals from dehydration
• Protects trailer and boat electrical connectors from corrosion
• Works in wide temperature ranges for year-round use

How do I apply this grease safely and effectively?

Clean and dry the target surfaces before applying a light, even coat with the included brush to avoid excess buildup. Avoid placing grease on contact surfaces where mating metal-to-metal conductivity is required; apply it to connector boots, rubber seals, and the outer surfaces of insulated contacts. Wipe off any excess with a clean cloth and reseal the container after use to keep the paste fresh.

• Prep surfaces by removing dirt, oil, and corrosion first
• Use the lid brush for thin, accurate application; less is better
• Do not coat metal contact faces intended for electrical conduction
• Store tightly closed away from extreme heat and direct sunlight

Who is this for: Mission Automotive Silicone Dielectric Grease Paste is aimed at DIY mechanics, professional technicians, boat owners, and anyone who performs routine electrical or rubber-seal maintenance. If you work on ignition systems, trailer wiring, marine connectors, or need a reliable waterproof sealant and lubricant for automotive gaskets and pins, this 8-ounce paste provides a convenient, brush-applied solution built for long-lasting protection.