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Ospho is what you want, and it does work - You can buy it from Amazon http://www.ospho.com/ Remove loose rust, spray it on, let it dry and it converts the rust to a hard coating which won't rust again Don

The Pros - If you drive a vehicle known for rust out problems, undercoating can greatly extend the life of your vehicle, especially if you live in an area where they use chemicals or salt to deal with snow and ice in the winter time. I guess it can also give you a bit quieter ride. Can't think of any other advantages The Cons - It's expensive. It's messy if you need to do work under the car on any part that gets sprayed or oversprayed. It adds weight to your vehicle. Is it worth doing to your TC? Has anyone ever heard or read about a TC anywhere with serious rust problems? Not many modern vehicles are prone to rusting out these days - This wasn't the case 20 or 30 years ago when undercoating was a popular aftermarket option. Many cheap (and even some not so cheap) cars had holes rusted through them before the payment booklet was empty, but that's not the case very often anymore - Car manufacturers got lousy reputations for building rust buckets and they were pretty much forced to build longer lasting vehicles . . . . cars cost more, engines are better, oils are better and it's not uncommon now for people to keep a car for 200 to 300 thousand miles and you can't do that if the body doesn't hold up If you like undercoating, maybe because you live where they do salt the roads, or maybe you like the quieter ride, or maybe it just gives you an added sense of security, I wouldn't try to talk you out of it - Take your brand new vehicle and get it undercoated the day you drive it off the dealers lot. It's not THAT expensive and there are some benefits. But unless you're planning to keep your 2012 for another 15 years, I wouldn't even think about trying to scrape and brush existing rust off a 5 year old car and then paying to have it undercoated. The horse is probably out of the barn at that point. You'll never get it clean enough to get good adhesion and I don't think you'll be extending the life of the vehicle enough to make it worth all the time, trouble and expense - You could spend 20 hours under there with scrapers and wire brushes and still never get it really clean Either way, post an update here in 2032 and let us know how it works out . . . . I might be all wet in my thinking, who knows? Don