Factory gaskets do not need a sealer, all it does is cover up an underling issue temporarily similar to over torqueing (past 18 ft/lbs you pull studs out of the casting). (good possible weekend fix at dunes),

If your not sealing you are pulling a stud, stretching a stud, head and cyl surfaces are not flat or you have a detonation issue hammering away at the gasket, or too much compression for oe head stud (87cyl).