Sounds like an incomplete cure from insufficient UV light. I use Bone Dry by Solarez, no need for any other coating on the threads beforehand. When my UV light batteries start to decrease power this happens. To fix it you can either use a stronger light/new batteries, or place the tacky threads in a window sill in full sunlight to finish them off.
One item of note about UV cure glue, some people have an extreme allergic reaction to the fumes and it makes their face puff up and get all red. It's actually pretty bad for those who it bothers.
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