The 2 large plugs I removed went back in tightly, but I can see your point.
If anyone takes the vehicle for a professional spraying, I would definitely show them the larger plugs so they can get their (large) wand inside the cavity. Typically they only drill access holes on top of the rocker (inboard of the door seal), and in the Prius' case, that means they'll only be rust-proofing the inner rocker compartment, not the outer one with the rust problems.
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