I use sealant on all gaskets. My choices are either clear RTV or Permatex "high tack" spray (red stuff). Either can be applied selectively with a Q-tip. RTV I use for gaskets that come off sometimes, Permatex for everything else:
the 8 rocker gaskets? - The little ones on the head: Permatex. The 3 valve covers: RTV
primary cover? - Permatex
primary to engine? - Permatex
primary to chain tensioner? - What's a chain tensioner?
Gearbox cover? - Permatex
timing cover? - Permatex
I'll add:
Outer primary - RTV against the O-ring
Intake to head - RTV