Permatex Ultra Copper Silicone Gasket Sealant 3oz - Harley & Indian V-Twin
About Permatex
Permatex has manufactured chemical solutions for vehicle assembly and repair for over a century — thread lockers, gasket makers and sealants that show up in nearly every V-twin service procedure.
Permatex Ultra Copper Silicone Gasket Sealant is a high-temperature RTV compound specifically formulated for the demands of V-twin motorcycle engines. This 3oz tube provides superior oil resistance and flexibility, making it perfect for Harley-Davidson and Indian Motorcycle engine rebuilds and repairs.
Why riders pick this
- Three times more oil resistant than conventional silicone
- Eight times more flexible than traditional gaskets
- Handles continuous high temperatures
- Ideal for engine rebuilds and repairs
When you're working on a high-performance V-twin, you need a sealant that can handle the heat and the oil. Permatex Ultra Copper is engineered to outperform conventional silicones, offering three times more oil resistance and eight times more flexibility. This means a more durable, leak-free seal on crucial engine components, even under extreme operating conditions. It's the sealant of choice for critical areas exposed to high temperatures.
Unrivaled Performance for Hot V-Twins
- Three times more oil resistant than standard silicone sealants
- Eight times more flexible than traditional cut gaskets, preventing leaks from vibration
- Formulated for continuous high-temperature exposure
- Ideal for engine gaskets and high-heat applications
Build for Durability and Heat Resistance
From primary covers to exhaust flanges, your V-twin generates serious heat. Permatex Ultra Copper is designed to maintain its integrity across a wide temperature spectrum, ensuring your seals hold up when the engine is pushed hard. Its enhanced flexibility also means it can better accommodate thermal expansion and vibration, common challenges on performance Harley and Indian builds, providing a lasting seal where it matters most.
Specifications
- Brand: Permatex
- Manufacturer Part #: 81878
- UPC: 686226818782
- Weight: 3.27 lbs
- Tube Size: 3 oz
Common questions
What temperature range can this sealant handle?
Permatex Ultra Copper Silicone Gasket Sealant is rated for continuous use from -65°F to 700°F, making it ideal for engine gaskets and other high-heat applications on V-twins.
How does this sealant compare to regular silicone sealants?
Ultra Copper offers significantly improved performance, with three times more oil resistance and eight times more flexibility than conventional RTV silicones, which helps prevent leaks and movement on engine gaskets.
Is this suitable for both Harley-Davidson and Indian Motorcycle engines?
Yes, this sealant is specifically formulated for V-twin motorcycle engines, including applications on both Harley-Davidson and Indian Motorcycle models.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Permatex |
| TYPE | Chemicals |
| SKU | 59-9192 |
| WEIGHT | 3.27 lb |
