I personally love gorilla clear glue. Doesn’t discolor eye and have yet to have one pop off. A lot use two part epoxy be it 5 minute or 30 minute. I don’t like epoxy. I’m in no hurry though. I do one side of eyes and then 2 hours later or so do the other and then let set for a day or so. I used Sally’s once when I 1st started and never again.