Can this be used on a valve cover gasket to get a better seal?

Yes. It is better than OEM gaskets in that it conforms to any warpage, dents, dings, & other incongruities, whereas OEM gaskets are designed for factory new, perfect valve covers without flaws. Withstands 700 degrees.

Can I use this product to seal several non-moving parts of a wood burning stove instead of the standard gasketing material?

This gasketting goop is absolutely incredible for sealing wood stove parts. I’d certainly never use it on the fire box. But it can and will hold to moving parts in high temperatures. It lasts for several years on one application.

can I use this to seal radiator tubes to a heat exchanger in my gas furnace? Gaskets no longer available for it.

Greetings! As I don't know this application, specifically, I can say that say that Ultra Copper is excellent for sealing liquid coolant surfaces in truck/auto repairs. Temperature, up to about 800*F and pressures exceeding 15 psi will remain sealed with this product. U.C. remains a pliant sealing silicone "glue", but it won't harden, as epoxy does. If you need a sealer that also hastens, look elsewhere. If this is for a flange or any flat, secured surface, you're good-to-go. NO acetic acid in this product, if that's a plus for you.

Can I spread this on outside of exhaust manifold leak like you would caulk something or does it have to go between parts? F150 '04 V8

It is too much pressure and heat to use any caulk or rtv. Even muffler cement doesn't work. You might have a lean fuel mixture to cause the problem in he first place. Exhaust bolts rust solid from heat erosion, use the right amount of points on the socket to get bolts out(6 sided bolt--6 sided socket) Copper metal exhaust gaskets work well. Mr. Gasket brand.

Ultra Copper Gasket Maker | Desertcart KUWAIT

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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الحساب عربة التسوق

Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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KD 6.40

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Description

🔥 Seal the deal with ultra copper power!

FLEXIBILITY THAT LASTS - Eight times more flexible than traditional cut gaskets, ensuring a perfect, lasting seal even under vibration.
SENSOR SAFE LOW ODOR - Formulated to be non-corrosive and safe for sensitive engine sensors, with minimal odor for a cleaner workspace.
SUPERIOR OIL RESISTANCE - Three times more resistant to oil than standard silicones—keeps your seals intact under pressure.
UNMATCHED HEAT ENDURANCE - Handles extreme temps from -75°F to 700°F intermittent for peak engine performance.
UNIVERSAL FIT FOR HIGH PERFORMANCE ENGINES - Ideal for turbocharged, 4-cylinder, and high-performance engines—perfect for exhaust manifolds, valve covers, and more.

Permatex 81878 Ultra Copper RTV Silicone Gasket Maker is a high-performance, sensor-safe sealant designed for extreme temperature ranges (-75°F to 700°F intermittent). It offers superior adhesion, exceptional oil resistance (3x conventional silicones), and unmatched flexibility (8x cut gaskets), making it the go-to choice for turbocharged and high-performance engines.

Specifications

ASIN	B0002UEOPA
Best Sellers Rank	#2,753 in Automotive ( See Top 100 in Automotive ) #6 in Gasket Sealers
Brand	Permatex
Customer Reviews	4.7 4.7 out of 5 stars (3,456)
Date First Available	June 3, 2025
Exterior	Painted
Item Weight	3 ounces
Item model number	81878
Manufacturer	Permatex
Manufacturer Part Number	81878
Model	Permatex 81878
National Stock Number	8030-01-598-1435
OEM Part Number	PMT81878
Product Dimensions	8 x 4 x 2 inches
Special Features	Forms a superior bond on oil contaminated metals and maintains outstanding oil resistance

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