Whatever you use, if it's affected by water be sure to protect it from the rain water that will get on it. Most door panels I've seen had a coated paper deflector on the inside of the panel. Those didn't last well so they eventually went to plastic.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.