I tie flies, so I have a lot of different colors of nail polish for my streamer heads and eyes. I use them to paint the unsides of my blanks. I started painting the tubes with a sharpie, but I noticed on really thin sectionsof light colored blanks, the ca showed bubbles, and the epoxy would be even worse. (I have a really nice Flattop in Berea's Tequilla Sunrise that looks blistered) Now, the only problem I have is deciding which color to paint multicolored blanks.
Dave