If you use wood glue it needs to be waterproof or it will dissolve, something like titebond III. If you go for epoxy most 24h brands will be fine, I've used some expensive shit and non-expensive stuff without issues. People here are complaining about epoxy ruining holes but I have never had an issue. When you take your binding off the epoxy stays with the ski and less so with the screw, any that comes off with the screw can be removed with a knife or wire brush. Screws come coated so epoxy doesn't bond well to the screw. Like others have said it's mostly to keep water out to prevent rot and doesn't add much to screw retention, four 9mm screws can only do so much.