IMO, a hood liner is great for keeping engine noise from traveling up but horrible over the long term. They collect all the dirt and dust, varmints love to live there and build nests, and they hold moisture that leads to other problems. You could always spray a light bed liner or rock guard on the inner structure to protect it. Nearly every old fat fendered car or truck I've ever looked at didn't have a hood liner. I have seen some people that made stainless pieces and affixed them to the inner structure to add some shiny bits under the hood.

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