Kapton isn't really sticky, it is just a material that can withstand high heat and doesn't tear off easily like Blue tape. It is a film instead of a coated paper. You should still use some type of adhesive on the Kapton, like glue stick or hairspray, or ABS Slurry with for ABS prints. I don't think anything beats a nice think borosilicate glass/pyrex, with whatever adhesive is needed. It is flat and easy to clean because nothing permanently adheres to it. It is easy to scrape clean with a razor. Maybe the build tak stuff would come close, I haven't tried it yet.