Undercoating & Aluminum Panels

[2023bronco]

What areas of the Bronco are people undercoating with Fluid Film, Woolwax, Waxoyl, etc?

Apart from the frame / undercarriage, what areas of the body are aluminum? Hood? Front Fenders? Doors? Rear Fenders? Are people coating behind/inside any of those and, if so, why?

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[MNbronco]

only rear fenders are steel, use a magnet and it’s easy to find