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I guess it's about 15 to 25 kg for a midsized car, so not worth the hassle of stripping the whole car of it's paint and then adding some rust protective layer. Unless you realy want to do this and spend a lot of hours.
What you could consider is removing the underbody sealing. This thick layer in the wheelarches and on the underside of your car is quite heavy. Another thing you could consider is drilling holes in the non supportive metal, or even small ones in the supportive metal. That way it would save you time and have more effect.
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