The welded in brackets with a nut inside them is a form of cage nut.
You de-grease, rinse off, then petal-prep, and wash off again. If you have a bit of flash rust, it's no big deal, as that is just more adhesion for the POR-15. But if your metal is freshly sandblasted you do not need any of the degreaser or metal prep, unless you have handled the metal with oily gloves or really sweaty hands.
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