We used to use graphite powder or mortar dye before we ever used twine. Heaven forbid that stuff ever becomes "in" again - it will coat everything in sight (and out of sight, too - you'll blow it out of your nose and cough it up for days) and it really didn't do all that much good. Glue and paint will do much more to build leg hair. But if you have to try it, we got graphite powder at most any implement dealer (intended to be used as a lubricant in planters and grain drills) and mortar dye (just what the name suggests - used to turn mortar black) at a brick plant. Graphite is the darker and shinier of the two, but still pretty flat looking if you use much. Mortar dye is slightly larger granules.