IS THERE A BETTER EPOXY?

[tailgrabber]

I have been tying poppers and crease flies, and when I put my epoxy finish on them some remain soft while others harden nicely. I have been using the locktite 2 parts. I have used 1min with self mixer, 5 min selfmixing and the mix it yourself kinds it seem like 60% harden the right way. Anyone else have this problem or have the solution?
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