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I am not a car manufacturer or painter, but rust proofing and sealing is done with factory paint.
I would not pay $400 for anothere rust proofing job, in my non-expert opinion, it is a rip-off. If you plan on keeping the car for a long time, then later on you might want to consider rust-proofing, but I am sure you can find it cheaper than $400.
Just take care of your car; wax it, love it, be gentle. It should be fine.