Permatex Ultra Copper Silicone Gasket Sealant - 3oz

Permatex Ultra Copper silicone gasket sealant is a high-temp RTV compound formulated for V-twin motorcycle engines. It resists oil three times better than conventional silicone and handles continuous temperatures from -65°F to 700°F, making it ideal for Harley and Indian engine rebuilds and repairs.

Features

• Three times more oil resistant than conventional silicone
• Eight times more flexible than traditional cut gaskets
• Temperature range -65°F to 700°F
• Single 3oz tube

Specifications

• Brand: Permatex
• Manufacturer Part #: 81878
• UPC: 686226818782
• Weight: 3.27 lbs
• Tube Size: 3 oz

Fitment

Suitable for V-twin motorcycle engines, including Harley-Davidson and Indian Motorcycle applications.

Frequently Asked Questions

What temperature range does this sealant handle?

Rated for continuous use from -65°F to 700°F, ideal for engine gaskets and high-heat applications on V-twins.

How is this different from regular silicone sealant?

Ultra Copper offers three times more oil resistance and eight times more flexibility than conventional RTV silicones, preventing leaks and movement on engine gaskets.

Is one tube enough for a full engine gasket job?

One 3oz tube covers typical gasket sealing tasks. A full rebuild may require multiple tubes depending on application.

Do I need to remove old gasket material first?

Yes — scrape away all old sealant and gasket material before applying Permatex for best adhesion and seal quality.