Even the smallest of cracks and dings (like the one above) can leak water and lead to the eventual demise of your precious stick. Wax, duct tape, and stickers are all half ass ways to "fix" a board. To do it right and ensure its longevity, follow these easy instructions. The board I worked on today just had a crack in it, but if left alone it would take in water and create a weak spot, eventually breaking where the foam was decayed.
*By the way, a good ding repair guy is like a plumber—they'll always be in need.
Step 1: Get set up. You're going to need resin, catalyst, fiberglass, sandpaper, a razor knife, popsicle stick, cup for resin, and somewhere to work. I'd normally crack a beer for this whole procedure but it's 10am and I'm at work.
Step 6: Put a little dab of resin (that's already been mixed with catalyst) onto the surface of the ding. This will help the piece of fiberglass you cut out stick to the ding and create a good bond. I put a bit too much on in the photo above, you only need a dab!
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Step 12: Once your final coat of resin is dry use a high grit sandpaper (I used 320 grit with a little splash of water) to finish. Again, don't sand through your work, just take down the edges and lumps. You're board is now fixed and water tight, go rip!