Re: How do you identify your lines?
The only time I mark a line is when I have one off the reel. I coil them and use bred ties to secure the coil. A piece of masking tape or similar with the line designation, DT3, etc is all I do. The lines that are on reels are dedicated to those reels and the rod that the particular reel belongs with so I don't have any problem with knowing what they are.
If you have lines that you don't know what they are send Frank Whiton a PM. Frank knows almost everything there is to know about gear. He will probably be able to tell you how to weigh the lines in order to identify them.