ALeene's 7800 All Purpose Adhesive, or E6000 which is the same, both clear, at Walmart or Hobby Lobby.
You will find this a great glue that is flexible, water proof and very sticky and has a 1000 uses.
It sticks to PVC electrical tape and does well on greasy plastics like Delrin too.
See my post below on my use of Aleene's to fix a broken Delrin Lionel truck side.
https://ogrforum.ogaugerr.com/...elphin-plastic-truck
Charlie