As far as your final blocking at 320, I would read the tech sheet for the sealer and base to see what the manufacturer recommends for the product you plan to apply. It will probably be 400 grit, and maybe even finer if your spraying a metallic. Read the tech sheet for your product to see how they want the surfaced prepped prior to applying their product.
As for SMALL sand through spots, the reduced epoxy as a sealer should seal them. Just make sure it does before spraying the base.
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