Blue and Black box? I tried it once and was not happy with the results. I went to using the "professional" version in the gold box it worked out much better and I still use it to this day. For light line applications up to 15lb test. Also make sure you wet your knots before pulling them tight it makes a huge difference on these lines. It took me awhile to figure that one out too but its been fine ever since. Good luck!
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