I absolutely agree about splicing old line. Usually not worth the trouble. I charge a flat rate for different splices and when someone wants me to splice old line I charge by the hour. This usually discourages them.
I recommend simply tying a Halyard knot which is a lot stronger and takes up a lot less room than a bowline.
I like the sailcote idea HyLyte. Haven't tried that. I have found that a little baby powder helps with the tight ones sometimes. I always powder up Sta-Set X splices.