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 the heat, own the street!

RAPID DRY TECHNOLOGY - Get a quick, durable bond that saves you time on every repair.
FLUID RESISTANT SHIELD - Engineered to resist gasoline and all automotive fluids, ensuring long-lasting protection.
VERSATILE HIGH TEMP USE - Ideal for cylinder head and exhaust manifold gaskets—trusted by pros for critical applications.
HEAT DEFYING PERFORMANCE - Protect your gaskets from burnout even under extreme temperatures up to 500°F.
PRECISION SURFACE SEALING - Fills minor surface imperfections and hot spots for a flawless gasket fit.

Permatex 80697 Copper Spray-A-Gasket is a fast-drying, high-temperature copper adhesive sealant designed to improve heat transfer and prevent gasket burnout. It fills surface imperfections, resists automotive fluids including gasoline, and performs reliably in temperatures ranging from -50°F to 500°F, making it perfect for cylinder head and exhaust manifold gasket applications.

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Material	Copper
Brand	Permatex
Style	Compact
Item Weight	12 ounces
Item dimensions L x W x H	2.63 x 2.63 x 6.38 inches
Water Resistance Level	Water Resistant
Item Form	Spray,Spray-a-gasket
UPC	686226806970
Unit Count	18.0 Ounce
Global Trade Identification Number	00686226806970
Number of Items	1
Color	Orange
Manufacturer	Permatex
Model	Permatex 80697
Product Dimensions	2.63 x 2.63 x 6.38 inches
Item model number	80697
Is Discontinued By Manufacturer	No
Exterior	Painted
Manufacturer Part Number	80697
OEM Part Number	80697

Permatex80697 Copper Spray-A-Gasket Hi-Temp Adhesive Sealant, 9 oz. net Aerosol Can , Orange

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