I think you are talking about the liner which is not a structural part of the boat. It's not deck, it's not hull. It's basically decorative. On my Hunter is was molded plastic held in place by some flimsy hardware. On my Ranger it was just some padded fabric adhered to the underside of the deck. The deck hardware penetrated it. On many boats it's a carpet like material. Of course a picture would be useful for obtaining suggestions for repair.