Superglue is great for skin rebuild, but not so good for deep cuts. While on a very remote island in Tonga I sliced across the back of my finger between my first and second knuckle of my pointer finger, all the way to the bone (somehow miraculously missed the extender tendon and bundle of nerves that run up the side). We had some medical grade superglue on board in a dispenser that had a glass vial you crush and a cotton swab tip for who knows what purpose (probably to filter out the glass bits!)... certainly not nearly as precise applicator as any other superglue bottle I've used. Anyway, while trying to hold the cut closed with my thumb and side of my middle finger I squeezed a drop of glue on the end of the cotton and touched it to the cut. A whole lot more glue than I intended wicked down into the hollow under the skin (pulled back meat) where it proceeded to "kick off" and smoke a bit... man that hurt! Anyway, a couple days later I had to tear it back open and pick out a hunk of glue that was almost the size of a corn kernel. I got smarter and used regular superglue to tack down some gauze on either side of the cut to hold it closed (kind of like a fiberglass patch), then painted over with several layers of liquid skin to waterproof it. Had to replace the patch a couple times over then next 2 weeks, but it kept the tropical infections out and healed up pretty well.