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I am guessing Phil is not a fan of an external fix for 2 reasons. Whaler purity and it is not the best way to repair.
If you engage a person that will use epoxy and cloth to make your repair. It will be stronger than the rest of the hull

It should involve an over lap of good to good f.glass, and possibly be on the exterior and interior of the damaged area.
With what you have done with a classic, made it clean and beautiful, I would not let this deter you from either making this repair yourself or getting in done.