Outdoor kitchen paint fail

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Hello

I bought some premade outdoor kitchen units a couple of years ago, nothing too expensive, just a sink unit on wheels and worktop/cabinet on wheels. I store them indoors over the winter and they do not get anything but morning sunshine in the summer.

The grey paint now seems to be fading and if you wipe the cabinets with a cloth the cloth goes grey so I assume some sort of oxidization or paint failure.

I would be a bit upset if this started to total paint failure and then rust, so I was wondering if anyone is aware of a product I could apply to create some sort of restorative / protective coating to restore the paint and perhaps give it a few years more of life?

Thanks

[JoshSm]

Paint is probably thin so there are likely limits on how much restorative polishing you can do, but I'd have thought waxing them with car product would do the same job as it traditionally did for solid unlacquered car paint?

Worst case is sooner or later it all needs a respray.