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

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Description

🔥 Seal the deal with copper power – don’t let your engine miss out!

FLUID FIGHTER - Resistant to all automotive fluids, especially gasoline—your engine’s best defense.
HEATPROOF HERO - Withstands extreme temps from -50°F to 500°F, keeping your engine cool under pressure.
INSTANT SEAL POWER - Fast-drying formula fills imperfections and seals gaskets on contact—no wait, no leaks.
VERSATILE APPLICATION - Perfect for cylinder heads, carburetors, exhaust manifolds, and any high-temp gasket needs.
METALLIC COPPER FINISH - Unique copper spray enhances heat dissipation and prevents gasket burnout like a pro.

Permatex Copper Spray-A-Gasket is a high-temperature, fast-drying metallic copper sealant designed to improve heat transfer, prevent gasket burnout, and instantly seal surface imperfections. Resistant to automotive fluids and effective from -50°F to 500°F, it’s ideal for demanding automotive gasket applications.

Specifications

ASIN	B000HBNUDQ
Best Sellers Rank	56,171 in Automotive ( See Top 100 in Automotive ) 397 in Fillers, Adhesives & Sealants
Brand	Permatex
Colour	Copper
Compatible Material	Ceramic
Country Of Origin	USA
Customer Reviews	4.7 out of 5 stars 1,538 Reviews
Global Trade Identification Number	00686226806970
Item Dimensions	6.7 x 6.7 x 16.2 centimetres
Item Form	Spray
Item Weight	0.75 Pounds
Item dimensions L x W x H	6.7 x 6.7 x 16.2 centimetres
Item weight	0.75 Pounds
Manufacturer	Permatex
Manufacturer Part Number	80697
Material	metal
Model Number	80697
Number of Items	1
Number of Packs	1
Style	spray, high temperature
Style Name	spray, high temperature
Surface Recommendation	Metal
UPC	686226806970
Unit Count	266 millilitre
Water Resistance Level	Not Water Resistant
Water resistance level	Not Water Resistant

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S$51

Duties & taxes included

In stock

Sold byAmazon SINGAPOREDelivered 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 SINGAPORE.

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