Spark Plug High-Voltage Insulating Silicone Grease — Ignition Coil Dielectric Compound

Ignition system reliability depends on the quality of the seal between the spark plug boot and the ceramic insulator. This high-voltage insulating silicone grease — formulated for ignition coil and spark plug boot applications — prevents the three most common ignition interface failures: moisture ingress causing misfires, corona discharge (arcing) through the boot wall, and rubber boot vulcanization to the ceramic insulator that makes plug removal destructive.

Technical Specifications

Three Problems This Grease Solves

• Moisture-induced misfires: Water in the spark plug boot creates a conductive path that bleeds ignition energy to ground instead of the plug gap. The silicone grease seal eliminates this water ingress pathway entirely.
• Corona discharge / arcing: High-voltage ignition energy can arc through a dry or cracked boot wall. The dielectric grease fills micro-voids in the boot-to-insulator interface, eliminating the air gaps where arcing initiates.
• Boot bonding to ceramic: Over time, rubber boots vulcanize to the ceramic insulator under heat cycling. Removing a bonded boot often cracks the insulator or tears the boot. The silicone barrier prevents this bonding entirely.

Application Instructions

1. Clean the spark plug ceramic insulator and boot interior with a dry, lint-free cloth
2. Apply a thin, even coat (approximately 0.5 mm) to the inside of the spark plug boot
3. Apply a thin coat to the ceramic insulator of the spark plug
4. Install the plug and press the boot firmly until fully seated
5. Do not apply to plug threads, electrode, or gap

Frequently Asked Questions

Q: Is this the same product as the other spark plug grease listing?
A: Both listings offer high-voltage dielectric silicone grease for the same application. This listing may differ in quantity or packaging — select the pack size that matches your service requirement.

Q: Can I use this on diesel glow plug connections?
A: This grease is formulated for high-voltage ignition applications. For diesel glow plug electrical connections, a standard dielectric grease or copper-based anti-seize compound is more appropriate.

Q: How often should I reapply this grease?
A: Apply at every spark plug replacement interval. The grease does not degrade significantly between plug changes under normal operating conditions.

Package Contents

• 1× High-voltage insulating silicone grease for spark plug and ignition coil applications (quantity/size as selected)

One application at installation — three ignition problems permanently solved.