would it work on a cylinder head? much as used for racing?

There is no single answer. The use of this sealant depends on the type of gasket you are working with. If you have solid copper gasket or a metal clad composite (say... copper foil skin sandwiching a fiber core) then yes it would work on those gaskets. If you have a composite fiber gasket with fire rings and no coating then again... it would work. If your gasket is of fiber construction and has a shiny coating on it that looks like varnish... don't use this spray without referring to the literature supplied with the gasket. Many modern gaskets come with a pre-applied sealant coating so you don't want to add additional (and possibly incompatible) sealant spray. Sorry, but as I said, it really depends on the type of gasket you are working with.

will this coating make the head harder to remove if necessary?

Actually, I used it and had to remove my head gasket six months after, not because of this stuff though. The gasket came off no problem. I don’t know if this stuff really does anything though. As long as your head and block are surfaced properly, you shouldn’t need it.

Can this be used on felpro gaskets for timing covers, thermostats, water pumps and so on?

I used it on head Gaskets and worked well so I don't see why not its a really tacky solution help hold gasket in place and seal

Can this be used on a gasket that sits between an aluminum head and aluminum engine block? Possible corrosion?

We use this on aluminum heads and blocks all the time for Mercedes-Benz

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S/S Permatex® - Copper Spray-A-Gasket - High-Temperatrue Sealant - 255g #80697

S/S Permatex® - Copper Spray-A-Gasket - High-Temperatrue Sealant - 255g #80697

Product ID: 63090843

Details

Brand
Permatex
Item dimensions L x W x H
6.7 x 6.7 x
Item weight
340 g
Material
metal
Style
spray high

⚡Fast-drying metallic copper sealant

🔥Temp range -50°F to 500°F

🛠️Seals instantly & resists automotive fluids

₩88349

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Description

🔥 Seal the heat, skip the burnout – your engine’s new best friend!

FLAWLESS SURFACE FILLER - Effortlessly fills hot spots and surface imperfections for a perfect gasket fit every time.
RAPID DRY COPPER SHIELD - Fast-drying metallic copper formula ensures instant sealing and superior heat dissipation.
HEAT DEFYING PERFORMANCE - Withstands extreme temps from -50°F to 500°F, keeping your engine cool under pressure.
FLUID RESISTANT RELIABILITY - Resists all automotive fluids, especially gasoline, preventing leaks and prolonging engine life.
VERSATILE HIGH TEMP SOLUTION - Ideal for cylinder head, carburetor, and exhaust manifold gaskets on any vehicle model.

Permatex Copper Spray-A-Gasket is a high-temperature, fast-drying metallic copper sealant designed to improve heat transfer, prevent gasket burnout, and provide instant, durable seals resistant to automotive fluids. Perfect for high-heat applications like cylinder head and exhaust manifold gaskets, it operates effectively between -50°F and 500°F, making it a trusted choice for professional-grade engine maintenance.

Specifications

ASIN	B000HBNUDQ
Best Sellers Rank	6,685 in Automotive ( See Top 100 in Automotive ) 90 in Fillers, Adhesives & Sealants
Brand	Permatex
Colour	Copper
Compatible Material	Ceramic
Country Of Origin	USA
Customer Reviews	4.7 4.7 out of 5 stars (1,549)
Global Trade Identification Number	00686226806970
Item Dimensions	6.7 x 6.7 x 16.2 centimetres
Item Form	Spray
Item Weight	340 g
Manufacturer	Permatex
Manufacturer Part Number	80697
Material	metal
Model Number	80697
Number of Items	1
Number of Packs	1
Style Name	spray, high temperature
Surface Recommendation	Metal
UPC	686226806970
Unit Count	266 millilitre
Water Resistance Level	Not Water Resistant

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₩88349

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Korea.

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TrustScore 4.5 | 7,300+ reviews

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