cya - CYAnoacrylate = "super glue". i'd be totally lost without the stuff for the instrument work i do and buy it by the mini case load.
in the short run, soaking or dribbling in water thin cya to the tapered ends of a woodie will do the best job of hardening the wood, since cya sucks into the grain via capillary action. however, the amount of added strength will be minimal at best - been there, done that.
if yer into woodies, just get yerself the dang braveheart/3 rivers nail footing jig - it's killer and worth every penny. it'll really strengthen the weakest part of any wood arrow and add foc weight at the same time. i slow-set epoxy my nail footings, for maximum strength.