One reason to switch from copper to graphite gaskets is to reduce electrolysis and preserve the aluminum heads. So installing them with a copper spray sealer seems counter productive. Is there something else we should be using or shall I just not worry about it ?
After years of fighting getting old gaskets off the block surface, I now make sure everything is clean and flat and use a coating of grease on each side of the gasket. No leaks on the last two builds. (Aluminum heads and Fel-Peo gaskets.)