DON'T use a sealer!
Most high quality head gaskets, like Cometic gaskets, are a Multi Layer Stainless (MLS) steel gasket coated in Viton, any sealer will most likely hinder the performance of the gasket.
I copper sprayed my last head gasket was a Cometic and it blew in about 2000 miles, I just put in a new one dry and it's still holding strong.
Just look at the factory recommendations and buy the best gasket you can find.
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