Foe beginners so there is no confusion.
The Spike-it eyes are "soft plastic" (PVC) and are glued on with PVC adhesive that actually " melts" the plastic until the solvent dissipates. If they stick as well as it appears they do, no extra dip in clear plastic is needed.
Any of the hard backed eyes are put on with super glue but need to be sealed by dipping in a coat of hot clear plastic or they fall off.
If you put hard backed eyes on jigs you need to put them on with a strong adhesive like epoxy or they fall off. I normally dip all my jigs with eyes in Seal Coat just to make sure they stay (or when I paint them with the airbrush).
I prefer to put eyes on my jigs vs baits when possible.