Cakey is right about super glue, you need to be very careful with it, and its dependant on the type of glue and the type of material you use it on, if you glue a knot together and then examine it undeer the microscope you will see that in some cases the glue will attack the material and weaken it, in other cases the glue will dry too had and also dry jagged at the ends over the material, this will act like a blade and on the end of the material bending, the fibres will cut and weaken the the material.
Good knots should not require any form of glue and I think 1 out of ten times the addition is glue is used withough thought and to give the angler confidence only, it really serves not purpurse in strenghtening a good knot.
Some knots don`t work with certain lines, make sure you are using the right knot for the material you are knotting ( Chilly Dave has done a lot of good research on this), the old Ghost was an excellent line, but the knotless knot didnt work with it.
If you really must use a glue you need a glue which does not dry hard and will not attack the material you are using, some type of polymer may work but it will take longer to dry, could be harmfull to water like and really is a waste of time, just use good appropriate well tidied knots, that really is all you need ans the knot will always be the weakest part of the line anyway, regardles of whgat anyone tells you.
