I been there, dun that. It, in my case, was not mixing well enough. I have seen other responses to this same question that said yes you can re-epoxy, but I sprayed mine with a clear buzz can and that worked. They were just a little tacky before I sprayed.
I have not had this problem again since I:
1. Got some graduated measuring cups from a pharmacist friend
2. Mix my epoxy until I think it is good enough and then mix it some more.
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