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You could just give your undercarriage a deep cleaning every once in awhile. The reason most people who drive their cars in the elements end up getting rusted out undercarriages (at least with new cars since a lot of older cars would rust no matter how meticulous you were) is because they never take care of the underside. Just think about it - how could rust logically form if you have an undercarriage that is consistently clean or somewhat clean and never has any caked on dirt on it for an extended period of time? A quicker and easier way of doing this is steam pressure washing it, or you can get it up on jackstands or a lift and scrub the heck out of it. Worth 3+ hours IMO since the ends justify the means. (This all applies to those who just deal with rain - winter/snow people on the other hand, you're gonna have to do this much more often to prevent corrosion.)
Even if undercoating protects the underside of the car, I'd prefer to keep it the way it was from the factory so that I can see if something is starting to go bad and tackle it immediately instead of finding out years later that I have a freakin' rust hole forming in my floorboard but couldn't see it because of undercoating. Not to mention, if you plan on keeping the car forever and then want to restore it 20-30 years down the road to factory condition, that undercoating'll be a right BITCH to remove.
Severe rusting is a lot less likely to happen as quickly with these new cars, anyway. The factory corrosion protection is a lot better these days than it was in, say, the 70's and 80's.
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