Vinyl wrap or paint
Ultralights,
I was not suggesting that vinyl wrap will cause corrosion in the substrate, simply that it will not provide any additional protection to the bare metal in the way paint does. Although the 2024 alclad used in PA28 series has a pure aluminium coating to provide the oxidisation layer this has most likely been eroded on an old aircraft. Without the oxidisation layer or a sealed paint layer the old 2024 is very prone to corrosion unlike the 5/6000 series used in boats.