Not just for beehive hairdos and potato cannons anymore - AQUANET Extra Super Hold hair spray may just be what you have been looking for to improve your 3D printer's first layer adhesion.
I made huge improvements with my leveling procedure ( http://www.thingiverse.com/thing:23257 ). Still, over time, even when my Kapton tape looked good and the build plate was level, parts would not stick.
Putting on fresh Kapton tape was the only thing that fixed this particular problem but it is a pain to do, the tape is expensive and I am cheap and lazy.
As luck would have it, I just happened to have a can of this hairspray laying around from a potato cannon project and thought "What the heck?". It does say "Super strong hold" on the can so I gave it a try. Like that first meeting of chocolate and peanut butter I had my "Eureka" moment.
I have not tried with large prints yet, but I did do an entire week of building miscellaneous small to medium sized parts with only one build plate level and perfectly bonded parts. There was no edge lifting even on parts that had a first layer chamfer!
It has to be good it has the word Miracle in the title!
WARNING! Make sure the build plate is cool! Keep away from sparks and flames and all that! This stuff is flammable - think James Bond!
NOTE: The hairspray has lots of multisyllabic chemical names on the ingredient list. I make no claims as to its safety.
UPDATE: I tried White Rain Extra Hold and it doesn't work well. The ingredients are almost the same but it doesn't have the VA/Crotonates/Vinyl or the Neodecanoate Copolymer. Must be what makes the Aquanet work?!