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

🔥Temp range -50°F to 500°F

🚗Resists all automotive fluids

⚙️Instantly seals & fills imperfections

$106.87

Duties & taxes included

In stock

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Description

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

FLUID FIGHTER - Resists gasoline and all automotive fluids, ensuring leak-proof performance every time.
HEATPROOF HERO - Withstands extreme temps up to 500°F, protecting your engine under pressure.
METALLIC MASTERY - Copper-infused formula improves heat transfer and prevents gasket burnout for longer engine life.
FLAWLESS SEAL FAST - Fast-drying copper spray that instantly fills hot spots and surface flaws for a perfect gasket fit.
UNIVERSAL COMPATIBILITY - Ideal for cylinder heads, carburetors, exhaust manifolds, and all high-temp metal surfaces.

Permatex Copper Spray-A-Gasket is a high-temperature, fast-drying copper sealant designed to instantly fill surface imperfections and hot spots. It resists all automotive fluids, especially gasoline, and operates effectively between -50°F and 500°F. Perfect for critical engine components like cylinder head and exhaust manifold gaskets, it enhances heat dissipation and prevents gasket burnout, making it a must-have for professional-grade automotive maintenance.

Specifications

ASIN	B000HBNUDQ
Best Sellers Rank	82,963 in Automotive ( See Top 100 in Automotive ) 471 in Fillers, Adhesives & Sealants
Brand	Permatex
Colour	Copper
Compatible Material	Metal
Customer Reviews	4.7 out of 5 stars 1,519 Reviews
Global Trade Identification Number	00686226806970
Item Dimensions	6.7 x 6.7 x 16.2 centimetres
Item Form	Spray
Item Weight	340 g
Item dimensions L x W x H	6.7 x 6.7 x 16.2 centimetres
Item weight	340 g
Manufacturer	Permatex
Manufacturer Part Number	80697
Material	metal
Model Number	80697
Number of Items	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

Reviews

G**N

Does the job perfectly!

Makes life so much easier with this. I used it to cover the clutch cover on a Bonneville T100 after replacing the clutch springs. Creates a nice seal with no oil leaks. Make sure both surfaces are free from old gaskets and debris.

16.01.2026

W**W

Cracking stuff!

Cracking stuff - wouldn’t use anything else!

22.11.2025

M**E

Copper thermal spray gasket

I used it on a three layer used metal head gasket as I needed to finish up quickly. A brand new head gasket was not only expensive but was not available in the time I needed to finish the rebuild. It worked fantastically and is still holding tight with no issues.

5.09.2025

L**D

Expensive but essential

Essential when using a solid copper head gasket.

31.08.2025

B**S

Worthwhile product

Bought this after a recommendation. It covers well and hopefully helps to conduct heat

17.07.2025

D**A

this suff is ace!

This is great for adding an extra level of seal when re-using a gasket.

22.08.2020

R**S

Good emergency aid

Does what it states on the tin

10.05.2021

O**R

Good delivery

Easy to use , very effective

15.11.2019

J**T

Too

Super Qualität

21.03.2026

R**L

It works as advertised. I’d buy again. Course one can will last a long long time.

Seems to be fine. I like what I see. Gaskets are nothing to cheap on, a lesson you learn after a blow out or two. This helps. Would buy again.

22.03.2026

オ**マ

効果ありそう！

ネバネバするのが良いんですかね？

18.05.2026

P**L

A good product

It did what the tech sheet specifications indicated. Easy to use.

23.03.2023

J**S

Buen producto

Llegó en tiempo

23.06.2025

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