Superglue often eats the elastic (yoicks) depending on the type of elastic you use, The lycra elastic especially dissolves into the glue (the flat fine very stretchy stuff often found in ready-made jewellery, also often multistranded). I find it is far safer to use a slower drying adhesive, and its much easier to keep the glue at the knot, not everywhere else al over the beads, or leaving pieces of you behind with the bracelet. Superglue does give a more rigid bond, and doesn't seem to last. I find my repairs are more successful with a slow curing adhesive, the ones that you mix the adhesive and hardener together. Jewellery seems to prefer just a little flexibility, maybe? Or the Hypo-cement for when you need that very fine needle dispenser ( and it takes the visually challenged me an extra 5 minutes to get the top back on, lol). I'm sorry that I don't have scientific reasons for this, I'm just relating my experience, and multiple experiments with different adhesives. And if my customers are d-i-y, then nail polish seems to be something they have at home somewhere, glue they often don't. (I don't get that, either, but so it goes!)