Polycarbonate paints will stick fine. Because the paint is on the outside doesn't mean it will fall off in an accident any more than if it was painted on the inside. If an impact can knock the paint off the outside it would also knock it off the inside as well.
The only downsides are obviously rolling it on a hard surface will scratch the paint off the body, and being developed for painting inside polycarbonate paints aren't designed to give the best paint finish.
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