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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Permatex 80697 Copper Spray-A-Gasket Sealant

Product ID: 3212940

Details

Brand
Permatex
Item Weight
12 ounces
Item dimensions L x W x H
2.63 x 2.63 x
Material
Copper
Style
Compact

🔥500°F heat resistance

⚙️fast-drying adhesive

🛡️resists automotive fluids

€ 33.23

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Description

🔥 Seal the heat, beat the burnout! ⚙️

RAPID DRY FORMULA - Sprays on fast and seals instantly—no downtime, just durable results.
HEATPROOF PERFORMANCE - Withstands extreme temps up to 500°F to keep your engine cool and protected.
VERSATILE APPLICATION - Perfect for cylinder heads, exhaust manifolds, and any high-temp automotive sealing needs.
FLUID RESISTANT SHIELD - Defies gasoline and all automotive fluids to prevent leaks and gasket burnout.
PRECISION SURFACE SEAL - Fills minor imperfections and hot spots for a flawless gasket fit every time.

Permatex 80697 Copper Spray-A-Gasket is a fast-drying, metallic copper adhesive sealant designed for high-temperature automotive applications. It resists temperatures from -50°F to 500°F, fills surface imperfections, and protects gaskets from fluid damage, making it ideal for cylinder head and exhaust manifold gaskets.

Specifications

ASIN	B000HBNUDQ
Best Sellers Rank	#7,858 in Automotive ( See Top 100 in Automotive ) #16 in Gasket Sealers #539 in Oils & Fluids
Brand Name	Permatex
Color	Orange
Compatible Material	Automotive
Customer Reviews	4.7 4.7 out of 5 stars (1,749)
Global Trade Identification Number	00686226806970
Included Components	Permatex 80697
Item Dimensions	2.63 x 2.63 x 6.38 inches
Item Form	Spray,Spray-a-gasket
Item Type Name	BONDING_ADHESIVES
Item Weight	12 ounces
Manufacturer	Permatex
Material Type	Copper
Model	80697
Number of Items	1
Number of Packs	1
Part Number	80697
Style Name	Compact
Surface Recommendation	Miscellaneous
UPC	686226806970
Unit Count	18 Ounce
Warranty Description	Manufacturer Warranty
Water Resistance Level	Water Resistant

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€ 33.23

Duties & taxes included

In stock

Sold byAmazon PortugalDelivered 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 Portugal.

Secure transaction

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Join PRO →

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TrustScore 4.5 | 7,300+ reviews

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

Fatima A.

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