Napthalene will not air out, it will stick in the wax too much and it will kill bees. Both PDB and Napthalene are carcinogens...
I get PDB moth crystals at Walmart pretty cheap. I'm not a big fan of using it, but sometimes I use when I get an infestation. I'll pull the infested frames and zap em with it. I know I can freeze them, but I don't have alot of freezer space and I don't like cleaning up all the little worms off my lean cuisine boxs ;)