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🔥 Seal the deal with the ultimate high-temp gasket maker!
Permatex 81878 Ultra Copper RTV Silicone Gasket Maker is a professional-grade, sensor-safe sealant designed for high-performance and turbocharged engines. It offers superior adhesion, exceptional oil resistance, and extreme temperature tolerance from -75°F to 700°F intermittent. Its flexibility and durability make it ideal for exhaust manifolds, valve covers, and other critical engine components, ensuring leak-proof performance and long-lasting reliability.
| ASIN | B0002UEOPA |
| Best Sellers Rank | #1,572 in Automotive ( See Top 100 in Automotive ) #4 in Gasket Sealers |
| Brand | Permatex |
| Color | Copper |
| Customer Reviews | 4.7 4.7 out of 5 stars (3,240) |
| Date First Available | June 3, 2025 |
| Exterior | Painted |
| Full Cure Time | 24 Hours |
| Global Trade Identification Number | 00686226818782 |
| Is Discontinued By Manufacturer | Yes |
| Item Form | Paste |
| Item Weight | 3 ounces |
| Item model number | 81878 |
| Liquid Volume | 3000 Milliliters |
| Manufacturer | PERMTX-LOCKT |
| Manufacturer Part Number | 81878 |
| Material | Metal |
| Model | Permatex 81878 |
| National Stock Number | 8030-01-598-1435 |
| Number of Items | 1 |
| OEM Part Number | PMT81878 |
| Product Dimensions | 8 x 4 x 2 inches |
| Special Features | Forms a superior bond on oil contaminated metals and maintains outstanding oil resistance |
| Surface Recommendation | Pipe |
| UPC | 686226818782 |
| Unit Count | 3.0 Ounce |
| Water Resistance Level | Waterproof |
S**D
good value, working well
good brand & product
A**R
Good go to
Works great. My badly made NEW rear catalytic converter with a warped flange was leaking and it was giving me a code. Tried several time with different gaskets, but ended up using this silicone and a donut gasket/ Haven't got a code since. Good stuff.
M**N
The Only RTV for High-Heat Engine Jobs
If you're working on anything high-heat, like an exhaust manifold or turbo application, this is the only gasket maker to use. The Ultra Copper RTV is a workhorse—it handles maximum temperatures without breaking down, shrinking, or leaking. It goes on smoothly, cures quickly, and forms a super durable, tight seal. I've used it on headers where standard RTV would just burn up, and this holds strong. It's the professional choice for reliability under extreme heat. Essential for engine work.
Z**R
Stuff works great for exhaust flanges on sports car
Sealed my exhaust flange gaskets making it a better and tighter fit worth no leaks.
C**R
N/a
Good products.
N**.
Works great if you apply properly.
Works great if you apply properly. Clean all metal surfaces completely with brake clean and let dry. Don't use under 60 degrees Hint: I lightly warmed up the pipes with a hot air gun before installing and let it set for 24 hours before starting engine.
F**K
High heat sealer
Just what's needed for fireplaces sealers
J**.
Strong
Good stuff for headers
G**O
説明書通りに使えばきちんと効果を発揮します。 そして剥がしやすい。
E**O
Este sellador de silicona de alta temperatura ha funcionado de manera excelente en las uniones del escape de mi motocicleta. Su resistencia al calor extremo garantiza un sellado duradero sin deteriorarse con el tiempo. La aplicación es sencilla y la adherencia es muy buena, asegurando que no haya fugas ni vibraciones molestas en las conexiones. Además, su formulación a base de cobre proporciona una excelente conductividad térmica y estabilidad en condiciones exigentes. En general, un producto confiable y altamente recomendable para sellar uniones expuestas a altas temperaturas, como sistemas de escape y componentes de motor. ¡Gran desempeño!
L**L
Sehr gutes Produkt.
R**1
Easy to use with nozzle and sets to form a gas tight seal
J**E
Product works very well, let is harden for at least 24 hours ! Exhaust leak resolved.. A+
Trustpilot
1 week ago
2 weeks ago