I put a THIN coat of silicone around the edge and tap it in with a socket that just fits inside the plug.
I've seen too many engines ruined by boneheads who slop everything full of silicone instead of using a proper gasket.
I once tore down a 3.0 Buick engine that was trashed because some idiot used so much silicone around the intake gasket that the coolant passages were obstructed.
And if anyone who reads this is addicted to silicone, if the shoe fits............
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