Superglue by it's nature cures with water. So it's useless trying to glue things that are moist or wet, they need to be dry then while held in place with glue, if the glue is thick and taking time to set, sprinkle water over it and it helps it set. Where I work, we sell fishing glue, which is better than superglue in that it doesn't break down in water over time. Ive yet to try it myself on plants but one day I will. On smaller plants it must be great to do away with the use of thread or cable ties but on large anubias and javas cable ties are great I think.
Cheers