Any tips on keeping waxed hair away for longer?

I actually switched from waxing my underarms and I now use an epillating machine (pulls out hairs). It gets the same effect only you can do it yourself easier. Since you have the machine at home you can just use it for touch ups as well. It's a bit of an investment, but in the end it's much cheaper than waxing at a salon.

rub brown sugar soaked in honey

exfoliate.