With UV Knot Sense you can smooth and strengthen your newly tied knots instantly. After application, it dries instantly with the Loon UV Mini Lamp, UV Power Light or with direct sunlight. Also works great for repairing damaged flies and finishing household items projects. Smooths out knots for easy sliding through guides Cures soft and pliable Instantly cures with sunlight or UV light Quickly repairs damaged flies Instructions for use: While shaded from the sun, apply enough UV Knot Sense to coat knots. Rotate line or use applicator to form UV Knot Sense to desired shape. Expose to sunlight or use Loon UV Mini Lamp or UV Power Light to cure. In direct sunlight (or when using Loon UV Lights) curing takes approximately 15 seconds.