I'm a fan of the UV Knot Sense that Loon makes. I wouldn't call it epoxy, but it is very easy to distribute on a fly, and cures quick with about 30 seconds of sunlight or a UV flashlight. I use it a lot on a lot of my small midge patterns and a few others as well. Some people complain that it gets a yellowish hue to it after a lot of use, but I mean that usually means its time to change flies when that many trout have chomped on it/![]()