You should really check the manual specific for your model.  However, most
Hondas require nothing on the head gasket.  All metal surfaces should be as
clean as possible.  Use of any sealants will likely lead to the failure of
the new head gasket.  Also be sure to use the correct head bolt torque
sequence.  Again, a manual specific for your model will be invaluable here.

Eric

OK...I'm ready to start putting my engine back together. Does anyone
know if there's anything out there you can use to make sure there's a
good seal on the head gasket when I put the new one on. For instance I
was wondering if you could use some of that high temperature Permatex
gasket maker stuff to make sure the thing was sealed for sure. I don't
want to put it on and then find that there's a leak afterwards.

Also what do you use to clean up the camshaft, Pistons, etc? I calle
NAPA and they quoted me 125 USD for a five galllon jug of "parts
cleaner". That seems very expensive and I don't know if I should use it
without harming something.