My friend Cindi did some thorough testing of pens for a signature wedding quilt and wrote a review about her results. She tested 10 pens, including Sharpies, PrismaColor, and Microns. The Sharpie and PrismaColor pens ran. The Microns faded quickly. Her winner was the Nano-Liner by Royal Langnickel, which is available at Hobby Lobby for $2.00.