Polishing yields the most dramatic difference in your paint and will bring out the gloss. You want to polish in order remove imperfections in the paint, such as swirls, scratches, water spots, etchings, and oxidation. Having these imperfections in your paint means that light that passes through gets refracted, ultimately dulling the finish, yielding less gloss and depth, less reflections, and can turn into an eye sore. Removing these imperfections, your paint will have the highest level of gloss and reflections are mirror like, with sharp accurate detail. I can tell you that I've seen pics of Lambo's come out straight from the factory with imperfections such as holograms and a good polishing made a world of difference.
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