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Permatex 81409 High-Temp Red RTV Silicone Gasket Maker is a professional-grade, OEM-specified sealant designed for extreme temperature ranges (-65°F to 650°F). It creates durable, formed-in-place gaskets that resist cracking and fluid damage, ideal for valve covers, oil pans, and other critical engine components. With fast initial curing and superior chemical resistance, it’s the go-to choice for heavy-duty automotive maintenance and repairs.






| Color | Factory |
| Brand | Permatex |
| Item Weight | 6.4 ounces |
| Liquid Volume | 11 Fluid Ounces |
| Full Cure Time | 24 Hours |
| Initial Hardening Time | one Hours |
| Item Form | Liquid |
| Maximum Gap Fill | 6 Millimeters |
| Surface Recommendation | Clean Dry Surfaces like Valve covers, oil pans, timing covers, water pumps, and thermostat housings |
| Water Resistance Level | Water Resistant |
| Number of Items | 1 |
| Manufacturer | Permatex |
| UPC | 686226814098 |
| Global Trade Identification Number | 00686226814098 |
| Unit Count | 11.0 Ounce |
| Material | Silicone |
| Model | 81409 |
| Product Dimensions | 1.88 x 1.88 x 11.25 inches |
| Item model number | 81409 |
| Is Discontinued By Manufacturer | No |
| Manufacturer Part Number | 81409 |
| OEM Part Number | 81409 |
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 .
Trustpilot
2 months ago
2 days ago