When working with Brett Barry's Svenpads, we highly recommend to use these hard to find uni-ball "Signo" Gel Pens, which offer thicker lines, no bleed-through and instant drying ink with very clear lines.
Do NOT ever use a Sharpie with your SvenPads®! Only use water based inks.
For your convenience, we offer the highly recommended and harder to locate uni-ball "Signo" Gel Pens which offer thicker lines, no bleed-through and instant drying ink with very clear lines.