Paint under the paint

Hi everyone,

Could anyone tell me why Moto Guzzi painted the frame using baked paint and than cover it with this super thin silver-like layer which comes off with a tiny scratch or even during cleaning.

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I had to clean the battery compartment because of my Yuasa leaking battery. I had some minor scratches at the frame next to the battery and I've decide to give it a go with the polishing paste.



Polished paint is at high gloss and have more gray color than the original. I say, it is a gray metallic paint.



Is there any other reasons,  besides the color, why Guzzi repainted the frame? Maybe some UV light protection?



It is definitely a metal layer because it reacts with some acids, like sulphuric acid. It didn't react with the paint itself.

Best to You all,

Chris