Effective waterproof superglue with precision micro tips for easy application to line and leader connections. Great for fly tying and useful to have around at any time! Zap-a-gap has a moderate setting time so you can accurately position whatever you are glueing before it sets. As it is reasonably viscous it will as the name suggests fill gaps between materials and smooth out knots. Great to have in your car or tackle box for quick temporary repairs in the field.