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Hot take: my old mentor in Dayton said never sand filler past 180 on a bumper cover, and I'm starting to think he was wrong
He told me back in 2016 that anything finer just polishes the filler and paint won't bite, so I stuck to 180 on every bumper for a long time. Last month I went to 320 on a scratched Forester cover and the primer laid down way smoother with zero lifting after 3 months in the sun. So who's actually wrong here, him or me, and what grit are you guys finishing at before sealer?
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