I no longer use epoxy putty at all. It's more of a pain, and really only holds about as well as a suction cup... if you don't get it first shot, and it starts to crumble, then your skimmer goes crazy.
However, as stated above Harvey's plumber's putty (blue and white tube) is fine to use, as well as aquamend.
Superglue gel works fine, and is how I mount all my corals in my tank. Just put it on the end of the frag plug, coral, or surface you want to glue outside the water, then stick it in place... hold for 15 seconds and you're good to go.