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I would block it out with 180g then prime w/ 2k. I would then wet sand it w/400 wet. When you get a panel blocked w/400 clean it up with water and look down it while wet, If it's wavy you'll see it and the you can fix it with 2k spot putty, spot prime it and check your work again after blocking with 400. The darker the 2k primer is the easier it will be to see what it looks like.
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