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I haven't seen any studies on it, but my guess is that the effect of UV on the thread is insignificant. Any amount of pull at all by the threading immediately pulls the finger trap closed, after this the line holds itself. The thread is really there just to limit the ropes sliding against themselves under no load conditions.

To try and limit this I still use dyneema whipping thread, or dyneema fishing line, but I really don't think it is necessary. But better to be safe.
 
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