I tried hairspray and had mixed results. With some prints it worked well but with prints that have proven troublesome with lifting, hairspray was a disaster. So far the glue stick has been the most reliable for me, YMMV. Plus hairspray is a hassle because i don't want to spray the gummy stuff around the machine which means I have to take the glass off, go into another room, spray, then reattach the glass. If it worked better it might have been worth the hassle.
I haven't done a scientific sample but it does seem that adding some heat to the bed helps with the difficult to print objects. I run 30C bed temp. In two sample sets of heat vs. no-heat on the same part, the warmed bed worked better both times to prevent corner lifting. Again not a scientific study, just an indication.
For reference, this is all printed with printbl.com PLA on a Bukobot Duo V1 (the old model).