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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🚗 Seal it, don't feel it! The ultimate gasket solution awaits!

COPPER COOL - Metallic copper formulation enhances heat transfer for optimal performance.
HEAT MASTER - Dissipates heat effectively, preventing gasket burnout.
SEAL THE DEAL - Experience instant sealing power that resists all automotive fluids.
DURABLE DEFENSE - Crafted to withstand extreme temperatures and conditions.
PRECISION PERFORMANCE - Fills hot spots and surface imperfections for a flawless finish.

Permatex® Copper Spray-A-Gasket is a high-temperature sealant designed for automotive applications. This fast-drying, metallic copper formula effectively dissipates heat, prevents gasket burnout, and improves heat transfer. It fills surface imperfections and seals instantly, making it resistant to all types of automotive fluids, especially gasoline. With a temperature range of -50F to 500F, this sealant is a must-have for any professional or DIY mechanic.

Reviews

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

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Manufacturer	Permatex
Part number	80697
Item Weight	340 g
Product Dimensions	6.68 x 6.68 x 16.21 cm; 340.19 g
Item model number	80697
Material	Copper
Item Package Quantity	1
Specific uses	Gasket
Batteries included?	No
Batteries Required?	No

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

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