+1 on the plastikote clear, I also agree that if you leave the body a week or so to fully cure then backing may not be necessary.
Theres plenty of backers though, tamiya white cans are good for backing also you can get createx backing paint among others.
If your really worried about rubbing etc and aren't afraid of a bit of extra weight then I'd say get some fender mender or shu goo, it leaves a rubbery coat and is really hard wearing.
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