One of the neat ways to seal the end(s) of rope or cord that I employ is to first wrap the end(s) with tape, usually of the masking variety. Then I will cut the end squarely through the tape to eliminate potential fraying. At this point I have the options of melting the ends, if meltable or sealing it with some adhesive. If one is in a hurry and only doing a few, then I would chose "super glue". The tape keeps it neat and at the end, only migrating a bit into the core and sleeve ( if that is the construction). I can then remove the tape or not.
The above is for end sealing, not splicing, although it might work as well. I just have never worked it that way.
Aside from super glue there are other solutions to be tried. I have used a product called "Modpodge" (which I believe is some kind of pv glue. It smells similar.).
Heat shrink tubing, if applied well, will last a long time through rough use. It is applied to climbing rope ends frequently, although the rope ends are melted also.
SS