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That panel looks pretty pitted. If it were me I'd hit it with an 80 grit pad on a DA and see what that does. I'm sure it's gonna leave some deep pits - so finish it off with a 36 grit grinding disc in the areas needed then go back to the 80 DA before building it up with some primer. Go easy using the 36 grit disc - use the flat surface not the edge of the disc to prevent sanding too deep. Also keep the pad moving - don't stay in one place too long.
Good Luck-
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