Paint Tech, Guide - Body Basics
4. Although the out-of-the-box condition of aftermarket fiberglass body parts is decent, you should sand the surface to ensure that it is straight and smooth. We recommend using a "long board" with 180-grit paper to get professional results. Using a small sanding block or handsanding is usually too inconsistent and will leave (or generate in some occurrences) high and low spots that lead to a wavy paint job. View Related Article
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