My opinion, if you plan to have a show car that is rarely driven, remove it all, and wax a and polish the area. For my car, I drive it and it has 193,000 miles. The factory put the undercoating on there to protect the metal of the fender from rock and road debris impacts that can and will cause dents, and impact bumps on the top of the fender. If you ever drive though gravel you will hear a lot of ting ting ting of gravel hitting the underside of the fender.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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