

🔥 Seal the deal with Permatex – where high-temp meets high-performance!
Permatex 81409 High-Temp Red RTV Silicone Gasket Maker is a professional-grade sealant engineered for extreme temperature resistance (-65°F to 650°F intermittent) and heavy-duty automotive applications. It forms durable, crack-resistant gaskets that replace traditional cut gaskets and enhance pre-cut gasket reliability. Trusted by OEMs and mechanics alike, it resists oils and fluids while curing quickly to deliver long-lasting, sensor-safe seals on critical engine components.






| ASIN | B000HBIB80 |
| Best Sellers Rank | #42,987 in Automotive ( See Top 100 in Automotive ) #46 in Gasket Sealers |
| Brand | Permatex |
| Color | Factory |
| Customer Reviews | 4.6 4.6 out of 5 stars (256) |
| Date First Available | April 1, 2004 |
| Full Cure Time | 24 Hours |
| Global Trade Identification Number | 00686226814098 |
| Initial Hardening Time | one Hours |
| Is Discontinued By Manufacturer | No |
| Item Form | Liquid |
| Item Weight | 6.4 ounces |
| Item model number | 81409 |
| Liquid Volume | 11 Fluid Ounces |
| Manufacturer | Permatex |
| Manufacturer Part Number | 81409 |
| Material | Silicone |
| Maximum Gap Fill | 6 Millimeters |
| Model | 81409 |
| Number of Items | 1 |
| OEM Part Number | 81409 |
| Product Dimensions | 1.88 x 1.88 x 11.25 inches |
| Surface Recommendation | Clean Dry Surfaces like Valve covers, oil pans, timing covers, water pumps, and thermostat housings |
| UPC | 686226814098 |
| Unit Count | 11.0 Ounce |
| Water Resistance Level | Waterproof |
S**E
Durability
Used the permatex to adhere a dryer door gasket to the door. Worked as expected being a permatex product. Have used their products in the past with great success and so far this job is no exception. Will continue with their products.
M**L
Exactly as Advertised and Cheap
Way cheaper than other places online and especially cheaper than the parts store. Exact product that it says it is.
J**Z
As described.
Bought this here cause it’s significantly cheaper than auto stores. Exactly the same product, just much cheaper. Works great for repairing small engines with hard to find/make gaskets. Would highly recommend.
L**S
.
Needed this product and it worked out great.
L**S
Just what I needed
I needed a high temp silicone to seal around the flashing for our wood stove chimney. It had not been sealed properly in the past, and leaked when it rained. I have used this product in the past for engine work and was familiar with the great sealing properties that it has. I was glad to find it available in caulk tube form. It worked perfectly, filling the voids and making what should be a permament seal. Now for some rain to try it! This is an excellent product.
J**.
Much better than regular silicone
Used this stuff on China walls on a sbc. Sticks better than the silicone found in home improvement stores.
N**R
Wood stove rope seal adhesive
Recommended by my chimney sweep to use instead of the runny, watery glue that comes with the kits. Wood stove has been running a couple weeks now and the rope seal is still firmly attached.
V**4
It works Great and it has a lot of uses
Its my go to RTV, water pump gasket no problem , need to repair a torn gasket no problem. You will find a lot of different uses for it .
J**M
sticks motor together real good
C**S
Works well, holds together well, dries reasonably quickly and has lasted over a year so far, outside, with no drying or breakage, sealing a smoker door (large temp variation).
Trustpilot
1 month ago
5 days ago