🔥 Seal the deal with the ultimate high-temp gasket maker!
Permatex 81878 Ultra Copper RTV Silicone Gasket Maker delivers industry-leading heat resistance up to 700°F, exceptional oil resistance, and superior flexibility. Its sensor-safe, low-odor, and non-corrosive formula ensures reliable, professional-grade seals on oil-contaminated metals, making it the trusted choice for automotive and industrial applications.
| Manufacturer | Permatex |
| Brand | Permatex |
| 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 |
W**L
Permatex
This is good copper gasket maker and seal.
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.
M**N
a must have when using band clamps on older exhaust systems!
a must have when using band clamps on older exhaust systems!
J**K
The Best gasket sealer I’ve ever used.
I’m a retired mechanic and over the years I’ve used many different gasket sealers. I have a clear favorite that never let me down and this Copper is the Best in my opinion. Do yourself a favor and get this if you don’t like oil leaks.
C**T
Get u sum
Ye haa diss sealed up my dual exhaust on my lawnmower.. ya. Get u som
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.
T**N
Just use it as recommended.
Good product.
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.
