Hardest but most thorough to easiest and flimsiest...
Option 1: Scuff it up and fiberglass it from the inside. Put a final piece on the outside to finish it off.
Option 2: Drill 4 small holes, two in front and 2 behind the crack, rivet a small aluminum plate in place to hold it together.
Option 3: Same as 2 but use zip ties.
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