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1,471 Posts
I haven't had a car undercoated since 1985. Our second oldest Honda (the '02 Accord) is only starting to get a slight bubble in the rear wheelwell. Nothing on the '04 Civic either. I agree that the undercoating does clog up drains that are built into the body to help drain off water when it accumulates--this happened on my '85. Not only that, there was undercoating oozing out of various places on that car for a couple of years, especially in summer when things would heat up. It also fouled a sensor that left me stranded on the highway, about 60 miles from the nearest city big enough to have a dealer. Parts were unobtainium, so they ended up soaking the sensor in brake cleaner fluid so I could get back on the road.

So yeah...I avoid it.
 

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Everything in Moderation
2006 CR-V EX, 5MT
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8,549 Posts
The body metal is galvanized underneath. The only thing that is corroded on our '06 after 12 years, are the brackets holding components to the underbody.
 
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