I took a fall off a homemade rail a few days ago. Somehow I walked out of the water with less board than I walked in with. I'm missing a chunk of one of my molded-in fins that's about 2 inches long, as you can see in the pictures. I'm definitely wanting to fix this myself, but I'm not sure what the best way to go about doing it is. I've seen some other threads where JB Weld was mentioned - does anyone have any experience with this, or would you recommend something else? What about shaping, sanding, etc.?