Silicone dielectric grease is the one for high-voltage and sealing work rather than general corrosion protection. The classic use is inside a spark plug boot — it stops the boot bonding to the porcelain, stops arc tracking, and means the boot comes off next time instead of tearing.

It also seals vacuum joints and O-rings, protects weatherpack and bulb connectors, and keeps rubber seals pliable instead of letting them harden and crack.

Worth knowing the difference from the connector gel: use the gel to keep water out of a crimped power connection, and use this on ignition components, O-rings and anything rubber that needs to seal and then come apart.

Specs

• Silicone dielectric and vacuum grease
• For plug boots, connectors, O-rings, vacuum seals
• Safe on rubber — keeps seals pliable
• 3 oz tube
• Manufacturer part number 91003
• Shipping weight: 0.25 lb

Bundle and save on shipping. Small parts like this ship in the same box as the rest of your order — add a few to one order and you pay shipping once.