I bought some black elmer's painters (paint pens) to try out. They come highly recommended! I suck at painting and really struggle. I have been trying to figure out how to make an edge with two different colors, to meet cleanly. I bought the pens to outline the edges. I bought one with a calligraphy (wide) edge. After struggling with it a little while, I decided to modify it. I cut a 90 degree piece out of the tip. This allows me to quickly edge my carving.
Hey, It worked for me!!