Shrinkies,nail glue,keratin,pretipping

 Hi! Ive been reading this forum for a while now and have a few questions about pretipping human hair....

1.) Is there a method to create tiny bundles of hair equally before pretipping so that all the tips are about the same size, how much hair is to be used per tip? 1/8" ,1/16"?

2.) I'll be using Keratin glue under Shrinkies, what is the best way to dip these in the Keratin, do you need a special mold to hold the hair (using a hot pot)?

3.) What is nail glue? I'm guessing it's what you apply acrylic nail with......does coating the pretip with this help adhesion,whats everyones favorite brand?

4.) Why is Keritan glue soooooo expensive? Does anyone know of a good wholesaler of this? I also heard carotene wax is also good for pretips....does anyone know where to buy this?

I have so many more questions....but dont want to overdo it...lol

Thanks!