Traditionally, ropework was painted over with white
paint. I think that even modern synthetic
lines will hold
paint almost as well as old cotton marline did. The
paint will soak into the fibers and get a grip. If your
line is synthetic and it''s starting to get a bit fuzzy, try going at it carefully with a Bic lighter before you
paint it. Don''t put the flame right on the
line, just get it close enough to melt the fuzz back. For that matter, a heat gun, the kind used to remove
paint may work too but I''ve never tried that. Of course, as with any job, experimentation is the key to success. Good luck and I''d love to see some pics.