What are the alternatives to epoxy resin?

Question

RFID

Knowing people, prompt, please, on a subject.
A transparent substance is needed, in which you can put an rfid key so that it turns out to be flexible when it hardens.
I want to enclose the heart of an ordinary plastic RFID key in a transparent shell. So that it looks cool and cannot break (if you put it in the back pocket of your pants and sit down).
The subject is unusual, but nevertheless very relevant for me.

Answer 1

1. hot glue, melt in a container, pour
2. if flexible, that is, one stupid option) I made a mold of glue for dragon cornices (google it, bought it on the market) if left for a long time, it polymerizes completely, to the full depth, it turns out transparent crap, soft to the touch, keeps its shape

Answer 2

Polyurethane adhesive, bought at any market. (The Chinese use this substance to fix the radio components on the board or the board itself to the case when they are too lazy to make normal fasteners.) Just remember that they are different for different manufacturers in different batches. When solidified, it can be flexible or solid, transparent or cloudy. If you have money and desire, buy 5-10 different bottles and try, at least one will contain a substance with the properties you need.