For the Online Card Class: A Cut Above - Day 2 (Window Cards) I used Claudine Hellmuth Multi-med to keep the twill from fraying. Works wonderfully.
It's true that copics don't bleed through the GinaK Luxury 120lb paper. I am excited to have the option of stamping and coloring right onto a card base. I will still be using my Copic X-Press It paper when I can layer, though, because it seems to blend a tiny bit better.