There is a very nice thread about Glui Kai here:
What is Glui Kai?
Of the bananas I ordered from AgriStarts, I placed about 1/2 of them so far outdoors, keeping a piece of used window screen above and around them -- about 1 foot away in all directions -- for about 2 weeks. I then removed the sides for a week, and finally the top. They are now all growing robustly.