Hey Keith,
Epoxy or PU, you're choice
Bagged will be best, or loads of weight!
Careful with the epoxy, as that need a certain temperature to work well (avoid doing that below 18degrees, or use a heat box).
If it's a smallish wing, epoxy 30mins will work well if you prepare everything really well (I use 30 mins epoxy for the wazeco as the wings are pretty small)
Vacuum bag and ash25 wings... Getting there!