Use a dry foam waffle pad, very lightly and very slowly ( must have variable speed buffer ) buff the whole car. You might be able to do it with an orbital polisher, but it would take a little longer, and don't use the application bonnet, use a very soft cloth one.
NuFinish is a pretty good product for certain applications, but as I said before, it's not really a wax. Think of it more as a cleaner, you don't get that fine layer of protection like you do with wax. If there is a body shop supply store near you, go in and ask them what they have in a good canuba...they may carry 3M products , which is what I always used in my shop. Also ask if they carry or know of a product called " Liquid Ebony " or " Liquid Ivory " best polishes I ever used, but aren't cheap( they use to be about $45 / litre). They will hide all the little scratches, and probably hide the wax too. Obviously ebony for dark cars, ivory for lighter ones.