Is it a sidewall or base gouge? If its a sidewall gouge I'd clean the wax out really well (or else the repair won't work) and then buy some hobby epoxy (something like g-flex) and then fill the area with it. Tape the base around this area before you fill it to prevent getting epoxy on the base.
If its a base gouge and it isn't deep at all then wax is probably adequate. If it looks like its close to core shot territory, then I would fill it using a ptex candle.
Good luck with the repair, post up pics to clarify if you can!
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