If the cloudiness is already there, as indiej said, it could already be clearcoat failure, which will require a repaint. If it's an old car with single-stage paint, then the outer layer of paint is most likely oxidized. The paint will need to be fed with an oil-rich glaze, and then the oxidized layers polished to reveal the good paint underneath.
Now, if you're asking if wax will keep the "cloudiness" aka oxidization from happening, then yes, it should - oxidization is primarly caused by UV exposure, and both carnauba wax and most (all?) sealants offer UV protection to the paint, whether it be clear-coated or single-stage.





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