Repairing chipped decal eyes?

So I have a pair of secondhand dealer made decal eyes that I've had in a doll for several months. I took them out today and when I removed them, the clear outer resin coating started to chip off on the spots the tack was touching, exposing the matte white part below.

I'm not sure if the tack I use is too hard (Duck Brand Reusable and Removable Poster Putty) or if it's just a matter of the resin used for coating. I haven't had this issue with any other eyes, so I'm guessing it was either the resin was too weak (?) or they were stored improperly. I'm not familiar with using resin at all so I'm not 100% sure.

Is there any way I can remove the coating and recoat them? Or would adding a second coat of resin prevent further cracking?