underbody advice

Personally, I would take the undercoating off. Anyplace on the body that was undercoated looked like new metal, with the exception of the rails. The rails have holes in them and moisture and dirt get in there. The rails rusted out from the inside and the undercoating hid the problem. My wife was PO'd because, "You took a perfectly good running car apart and now it is all in pieces." Well, I showed her the rails. I suppose with the /6 in the car, it would have survived for some time. But with a torque monster in it???