Loon Outdoors UV Knot Sense gives fly anglers a quick way to smooth and reinforce knots so leaders and tippets pass easily through guides without catching. Apply indoors or in the shade, then cure in seconds with direct sunlight or a Loon UV light. Beyond knots, it doubles as a handy fix for damaged flies when you need a fast streamside repair. Strengthens and smooths knots for easy passage through rod guides Cures in about 15 seconds with direct sunlight or a UV light Useful for quick streamside fly repairs in addition to knot finishing Quantity per pack: 1/2 oz. tube