just done a search and found this.hope it helps to fix your problem, i know its hard to find out but it would help to know if somebodys pulled it, or its happened frome wear and tear.
InstructionsThings You'll Need:
Fiberglass epoxy resin
Plastic resin applicator
Rotary tool
240 sandpaper
400 sandpaper
Gel coat enamel
Step 1Determine the actual size of the fiberglass crack. Oftentimes, the crack is longer and deeper than what the eye can see.
Step 2Take a Dremel or other rotary tool with a tungsten carbide cutter that is not much larger than the crack itself and widen the opening slightly to determine the length and depth of the crack. Hold the tool at a 45-degree angle and make a small valley along the crack.
Step 3Work a fair amount of fiberglass epoxy resin into the crack with the plastic applicator. Ensure that the crack is completely filled to the edges with resin.
Step 4Let the fiberglass resin epoxy dry according to the manufacturer's directions.
Step 5Sand the area with a quality 240 wet/dry sandpaper until hand smooth. Once this process is complete, sand over with wet #400 sandpaper.
Step 6Apply an similarly-colored gel coat enamel or sealer to the repaired fiberglass crack area.