I am using glass. It is slightly less sticky than the kapton, but has other benefits (look up for more info. Read through the solidoodletips wordpress blog- google this } just recommendations)
But when I'm feeling lazy and don't want to tune my print though it needs tuning, or when I have something with a tiny base and brimming won't be enough, I throw down some ABS glue.
I made some last night and it reallllyyy makes things stick. There are recipes online but I just filled a small bottle with approximately 70% acetone, and the rest was chunks of my failed prints. They dissolved overnight (20 hrs before I returned to the bottle) My application process is a very metered "dump a bunch on my print area, and smooth it out a bit if it's too thick." I do it before I heat the bed or before the bed gets above 50C. Then heat the bed. (I once did it after 50C and just got a weird foam. It still worked, but it's less safe to have bubbling acetone than slowly evaporating acetone.)
Yeah, then print on that. It's kind of like the mother of all brims.
Still, you want to first perfect the usual process of making sure you squish the first layer well, use good temperatures, and occasionally clean your kapton.