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.

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Description

🔥 Seal the deal with ultra copper power – your engine’s new best friend!

FLEXIBILITY THAT LASTS - Eight times more flexible than traditional cut gaskets, adapting to engine vibrations and movements.
SENSOR SAFE LOW ODOR - Formulated to protect sensitive engine sensors with a non-corrosive, low-odor formula.
SUPERIOR OIL RESISTANCE - Three times more resistant to oil than standard silicones, ensuring long-lasting seals.
UNMATCHED HEAT ENDURANCE - Handles extreme temps from -75°F to 700°F intermittent for high-performance engines.
UNIVERSAL FIT WATERPROOF - Perfect for diverse applications with superior adhesion on oil-contaminated metals and full waterproof protection.

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 triple the oil resistance and eight times the flexibility of conventional silicones, making it ideal for turbocharged and high-performance engines. This copper-colored, waterproof gasket maker ensures superior adhesion on oil-contaminated metals, resists vibration, and protects sensitive engine components with a low-odor, non-corrosive formula.

Specifications

Color	Copper
Brand	Permatex
Item Weight	85 Grams
Liquid Volume	3000 Milliliters
Full Cure Time	24 Hours
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
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

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