so lets get this straight.
you put blue tape on, heat the bed and then take the tape off ?

Why not simply use a glue stick ?
Much cheaper than the tape and by the sound of it you've made the bed uneven with the tape and cleaning gig anyway.

I did try glass, but to be honest you're not printing directly on the glass, so any flat surface will do.

Currently I've for a 3mm aluminium plate on top of the original warped plate - local aluminium engineering firm made it for me (clients of mine). If you had to buy one it would only be a few dollars.

On top of my aluminium I have a sheet of printbite.
Highly recommended as long as you're not using certain filament types - list on page 3 in this thread: http://3dprintboard.com/showthread.p...ntbite-surface

great for pla & petg