After testing it out further, that does happen, but for me the ink lasts a while before stopping. Long enough that I didn't realize as I was testing out the pen before I posted.
Hi, The pen does in fact work, as long as you seal the open end of the ink in step 4.
DIY Oil and Water PenView Instructable »
Easy Recycled Braided Dog Toys
DIY Washi Tape Stickers (Gr...View Instructable »
Easy Recycled Braided Dog ToysView Instructable »