I've been playing around with different adhesives for skis recently. Still have to try G-Flex, but so far I've had much better luck using JB-weld's "plastic bonder" than the typical slow-cure generic epoxy. It is made to help bond to thermosets (the epoxy your ski is pressed with), thermoplastics (abs sidewalls) and metal (edges), and so far it's worked as advertised, seems to hold as a filler where I have coreshots exposing edge anchors far better than other stuff I've tried, especially better than ski shop base weld repairs I've had in the past. Glued an edge back in two days ago on another ski but haven't had much time to see how it holds.
Whatever you use, make sure to wirebrush/sand and clean up the metal edges as best as possible before you glue them. Even the oils on your hands can mess with the bonding.