Hi Ciciak,
I used a very thin CA on the rigging ends. The very thin CA is like water as it soaks into the rigging line and dries. So, far, it has no residue. The lines were all Nylon of which I hate. I much prefer cotton rigging line so I can use beewax. If you have cotton line, then you can run your rigging line through the beeswax several times to make it more stiff. The knots will stay and no need for glue. it looks more natural than the CA. The CA will darken the lighter color rigging line.
I have found later on that the best way to make lines have a tension on them when they do not is to use like a 50/50 diluted water and white glue mix. Run the rigging line through this mixture, and then let the line hang with some weight on it. The line will be very stiff and easy to work with. For instance, if you have a very long YARD BRACE that will run almost the length of the ship, well, you know that the line is not going to be like a tight - rope. It is going to have some natural SAG to it as the weight of the rope will do that. So, you can use the trick I just mentioned. Then you can create your own "SAG" in the line and it will look very real and natural.