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🔥 Seal the heat, skip the leak — the pro’s choice for turbocharged confidence!
Permatex Ultra Copper RTV Gasket Maker is a high-temp silicone sealant engineered for extreme automotive applications, withstanding intermittent temperatures up to 700°F (371°C). It offers superior adhesion on oil-contaminated metals, sensor-safe low odor formulation, and exceptional flexibility—eight times that of cut gaskets—making it ideal for turbochargers, exhaust systems, and vibration-prone environments. Trusted by professionals for durable, leak-proof performance.
| ASIN | B0002UEOPA |
| ASIN | B0002UEOPA |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #17,911 in Automotive ( See Top 100 in Automotive ) #76 in Automotive Fillers, Adhesives & Sealants |
| Color | Black |
| Customer Reviews | 4.7 4.7 out of 5 stars (3,102) |
| Customer reviews | 4.7 4.7 out of 5 stars (3,102) |
| Date First Available | 3 August 2012 |
| Date First Available | 3 August 2012 |
| Included components | silicone |
| Is Discontinued By Manufacturer | Yes |
| Item Package Quantity | 1 |
| Item Weight | 85 g |
| Item model number | 81878 |
| Item model number | 81878 |
| Item thickness | 1 Inches |
| Manufacturer | permatex |
| Manufacturer | permatex |
| Material | Silicone |
| Part number | 81878 |
| Product Dimensions | 20.32 x 10.16 x 5.08 cm; 85 g |
| Product Dimensions | 20.32 x 10.16 x 5.08 cm; 85 g |
| Size | 3 Ounce Tube |
| Special Features | Forms a superior bond on oil contaminated metals and maintains outstanding oil resistance |
| Style | Permatex 81878 Ultra Copper Gasket Maker Exhaust - 3.5 oz. |
A**N
Do NOT apply on your exhaust flanges
My heart is still pounding as I was rushing in all directions trying to get something to extinguish the fire with. I applied this RTV on the collector flange, downstream the headers, to arrest a leak and correct the AFR reading on the wideband. I saw some smoke, and I thought maybe it's the high temp paint on the header. Next I saw flames, and you know the rest. Beware, for your own safety!
A**Y
This is a product that I use for securing a muffler to a Saito engine and it never vibrates loose. Well pleased and many thanks.
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.
S**D
good brand & product
Trustpilot
1 month ago
2 days ago