Rust proofing, does it work?

[Mechnutt]

I just bought a new 2018 Mazda 6 Turbo GT Reserve edition with the special Red Paint. It will be delivered to my home on Monday. I am going to get the Ceramic paint treatment which is warrantied for 7 years. They also offer undercoat rust proofing for $600. I live in Minnesota. I will be keeping the car a long time as I purchased their lifetime bumper to bumper warranty.

My question is, is it worth it for the rust treatment? I have read in years past that all this does is help a little with road noise but it does not help with rust. Mazda offers a 10 year guaranty against rust.

I almost pulled the trigger on a used Boss 302 Mustang with 26K miles on it in mint condition but I needed a daily driver. Maybe in a year or 2. Also drove a loaded Camaro but I could not get comfy and the visibility was awful

Thanks!

Larry

[mep]

I thought all of the rust proofing businesses went out of business years ago due to car manufacturers changing the way they prepped and primed their metal. Some rust proofing actually caused rust. Every place they drilled a hole in your car to squirt their magic goo was a rust starting point.

[the professor]

I agree with the way manufacturers are now painting the cars, rust proofing isn't needed. Sure was needed growing up in Illinois 30 years ago tho.

[VT Skier]

It works in Vermont, but I think it depends on person applying, and your car. I've been told that Audi and Lexus are less prone to rust than others.

And it's probably only worth it if you plan to keep your car for 10 years or more.

[Toomey]

Just helps the dealers bottom line.