I took a huge chunk out of my edge a while back on my lyman from hitting rails. Ive tried a handful of different epoxys, and each one dries rock hard, then on the next rail hit, just shatters and starts falling off in pieces. I started trying random things around my house that are water proof (my dad is in construction and we have a fair amount) and i found this to work very well
http://www.textureplus.com/downloads...20Adhesive.jpg
its made by PL you can find it at home depot. WEAR GLOVES, and i spread it on my edge, and used my fingers to shape it as close as possible, then after it dried, which took a good 2 days btw, i sanded it down with an electric palm sander with around 180 grit. its got some flex in it, and is totally water proof, i sanded all around where i was going to apply it also just to make sure it had a rough surface to grab onto. no problems so far, its not pretty, but its my winch board, so i dont really care. im curious to hear what other people recommend as well