Repair a Cracked or Buckled Polyurethane Surfboard

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If you don't have your respirator and eye protection on, now is the time to put it on. Sanding the foam will create a cloud of tiny foam bits flying around.
Sand the inside foam that you just revealed with rough sand paper until it is vertical and flush.
Place the sandpaper through the crack and pull back and away from the crack. This will smooth down the edges of the thin fiberglass on the top and bottom.

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