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i just did some paint work earlier today, and reading through all the paperwork that comes with the PPG paint. It recommended that before the basecoat, the surface is prepped by final sanding with 400-600 grit. Like cody said, start with like 150 if the stock parts are bad, and work your way up, like then 220, 320, 400. You should be good with that, i personally dont think 1000 grit is needed, and may actually be too smooth for new paint/primer to grab. but thats just what i read, i dont do body work for a living. lol. im sure paul or someone else could clear it up more.
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