Replacing cylinderhead

[Charles Levien]

Just getting ready to fit my new alloy head and was wondering if the headgasket should be coated with grease or gasket sealer prior to fitting.
What do you use on a modern copper gasket?

There seems to be a wide variety of opinions and experiences on this, from just grease it to using blue hylomar. 
I use the latter — spraying a thin film on all four surfaces which works well for me. Important though to torque down the head nuts with the central three leading the way.