I use Rain-X all the time on my windshield. It never occurred to me to even consider putting it on the rest of the car. I use it on the back windshield sometimes, too.
I wouldn't use it on any painted surface. If you are tempted, I would test it out on a small non visible area and then check it out after 24 hours or so.
I don't think that there would be a reason to need the type of protection that Rain-X provides on the rest of your car. For that, you need something stronger, like wax.
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