If the line is a weight-forward, I place the long mark at the front and the small marks behind. For double tapers, do the opposite. For sinking lines that are too dark to show any marks, use shrink tubing that you can find at any electrical supply store. At home, cut a half-inch section for a five and small sections for ones, and slide them on the line. Dip the line in water that’s been brought to a boil, and in seconds, the heat will permanently install the tubing.