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.

Material	Copper
Brand	Permatex
Style	Compact
Item Weight	0.75 Pounds
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
Item Weight	12 ounces
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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