Paint protection films work great and are just a tough sacrificial layer that is a good idea for high rash areas like the transom or sides that can contact a dock.
I am going to guess you mean IGL eco shield spray which is a spray on coating typically used on top of paint protection films.
There is no right or wrong here. Your boat, your call.
Had a few boards scuff the transom, but they were minor and buff out easy.
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2021 Supra SA 400
2018 Supra SA 400 (SOLD)
Michigan