Strength
Frp has a lot of strength in a tensil kinda fashion. But on a flat surface that has some area there will be alot of flex. Take a hit around that area without that added support you can start to lose interior hull bonds etc.
On the oldfishboat it keeps the vessel very stiff as well as adding protection from hits on docks etc.
So the rub rail protects even if its not what takes the hit.
Just my experience with.
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