I dont think its bad...
But then again I dont know for sure, doesnt apear to corrod anything?
A chem buddy did a report on what they use here, I'll have to ask him what the deicer stuff does.

 

It seems to me that every car made should have some sort of protective coating on the underside of all body surfaces and on all sub-frame components. It shouldn't weigh much more and it would increase the longevity and integrity of the vehicle.

Wait! Maybe that's the problem. Gee, if cars lasted longer the entire enconomy would collapse. True. Think about.

However, if you live/drive in an area of the country that uses salt on the roads, then getting a guaranteed undercoating is a no brainer.

I'm originally from MI and you can make some $$ by taking newer cars from Detroit and selling them on the West Coast and buying up classics and other older cars and selling them in the Salt zones of the nation.

Many young folks in places like Michgan have only seen 70s vintage muscle cars in magazines.

But...getting a new car undercoated in a place like Nevada or other salt-free area is a waste of money. And...gettin an A-market undercoating or DYI job in a salt area might be worse than just not driving it in the winter or making sure it is regularly washed top on bottom, since some coatings might actually trap salt deposits between the coating and the metal thus accelerating the oxidation process.

 

I was thinking of rustolium'ing the parts that get beat up the most like behind the wheels, but not sure how well it would stay on if I didnt go down to metal where I sprayed it.
then jsut paint over it with crylon