Gel Spun Polymer (GSP) tying threads can be extremely smooth, and will sometimes slip on materials or the hook shank. In order to overcome that, just add hard wax sparsely to a small piece of the thread. This can be done while tying, before a step where the thread needs to hold. The wax can be basically any kind of hard wax - made for fly tying, ski wax, toilet ring wax or anything suitable.
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