🔥 Seal the deal with ultra-copper strength!
Permatex 81878 Ultra Copper RTV Silicone Gasket Maker is a high-performance, sensor-safe silicone paste designed for extreme temperature resistance (-75°F to 700°F intermittent). It offers triple the oil resistance and eight times the flexibility of conventional gaskets, ensuring durable, waterproof seals on oil-contaminated metals. Ideal for professional-grade repairs requiring superior adhesion and longevity.
| Color | Copper |
| Brand | Permatex |
| Item Weight | 85 Grams |
| Liquid Volume | 3000 Milliliters |
| Item Form | Paste |
| Surface Recommendation | Pipe |
| Water Resistance Level | Waterproof |
| Number of Items | 1 |
| Manufacturer | Permatex |
| UPC | 686226818782 |
| Global Trade Identification Number | 00686226818782 |
| Unit Count | 3.0 Ounce |
| Material | Metal |
| Model | Permatex 81878 |
| Item Weight | 3 ounces |
| Product Dimensions | 8 x 4 x 2 inches |
| Country of Origin | China |
| Item model number | 81878 |
| Is Discontinued By Manufacturer | Yes |
| Exterior | Painted |
| Manufacturer Part Number | 81878 |
| OEM Part Number | PMT81878 |
| Special Features | Forms a superior bond on oil contaminated metals and maintains outstanding oil resistance |
| National Stock Number | 8030-01-598-1435 |
J**T
It worked
It’s sealant, it works, still going strong after having it on for quite awhile (Used it for my headers and connecting to the exhaust)
M**A
Works great. Nice product. Strong.
Works great.
A**R
Works great on V-Bands
Works great to seal V-Band connections on my downpipe. I was getting leaks from the V-Band with the metal to metal connection. I decided to try this RTV to seal the leaks. Initial impression, it’s working good. I don’t hear any exhaust leaks.
B**5
👍✨️
Product is as shown, works as it should.
B**D
Ultra copper sealer
Works well to seal hot surfaces and seems to last well.
G**T
High temp, but not recommended for oil and gas
Used it on a few things. So far so good. Unfortunately I did not read that it's NOT good for oil and gas products. The main reason I got it was to seal an intake leak on old cast iron head.
N**L
Good, but went on sale AFTER I bought it.
I used this for the various sealant requirements in my recent Mazda rotary engine rebuild. Rotor housing feet, front pulley bolt, oil pan. The color makes it stand out so when I got some squeeze-out from putting a little too much on the rotor feet, I could easily remove it before the oil pan was installed. The temperature range seems way overkill for this, but that's not a bad thing. While not specific to this RTV alone, make sure you clean the nozzle with a nail. Between uses you'll get boogers in your bead or a clog in the nozzle and nobody wants that.
S**Y
Great product
Great product
Trustpilot
5 days ago
1 month ago
