I tried this out with rubber cord. While it does technically work, the knotting is a little tricky to get nice and even and flat, and you will probably want to do some experimenting with the amount of glue you use to secure the knot. It will need more than the cotton cord does to stay secure. Also, just FYI, the sliding knot clasp won't work with rubber cord, because it won't slide very well. The links for the supplies in this video are located in the video description underneath this video.
Thank you very much. The video was not only easy to follow, but the captioning helped immensely. I am losing my hearing and it is hard to find videos that not only include captions but are easy to follow.