Rust treatment is implemented on all modern cars in the form of galvanized steel. Rust is usually only an issue if you get a chip in the paint and it gets to the metal. Don't let some shifty Ziebart sales guy try to convince you otherwise. Galvanized steel if properly washed and maintained should remain mostly rust free. Of course, if you live in a climate with a lot of salt and winter salting to the roads, do the undercarriage cleaning frequently as that's where rust will likely appear.

 

In addition lot's of parts like doors etc are aluminium.....

 

Aluminum can't rust, but it sure can corrode. Factory rust prevention has come a long way since the '70's and earlier. but when we travel from UpState SC where any road salt is very rare, I am amazed at how damaged many cars are. Cars that stay at the coast are also prone to rust. There is a spray wax coating called Cavity Coater that one can use inside lower door panels and such, via the drain holes. But the best advice per above is to spray underneath when you can, not always easy with frozen hoses. And do what you can to keep your paint protected and nicks repaired.

then there is the decision whether or not to use automated car washes. Some reuse the water, and if the filter is clogged, it will spray your car with all sorts of grit, not to mention removing your carefully applied paint protection. Best perhaps to just spray your car with a hand wand, and use some sort of coating like the new rinse/spray products you can buy from places like AutoGeek. I just despise rust, myself.

Enjoy your car, NV

 

Rust does exist on modern cars. It's hard to avoid as corrosion is a natural state of any metal product. However, the modern tech mitigates it to small bits and pieces under the vehicle. I mean, if you look at any muffler, most of them will have a little touch of the stuff. However, the days of rusted out bodies are pretty much gone. If you are freakishly attentive, @NAM VET makes some great suggestions.

 

In chicago with the abundant amount of salt used during the winter months I have seen quite a few modern cars rust. My old e55 amg started rusting and x5 under the bottom of the doors and arches thats with weekly winter washes. Alfas dont seem to paint much of the areas not viseable but only time will tell.

 

I don't know about you, but the Ziebart in my area is run poorly by very unprofessional people. In my opinion, the chances that their coating products will prevent more damage than their staff is likely to impart during annual applications is pretty slim. The value is also a bit dubious given liberal use of aluminum in the chassis and suspension.

If I was hell bent on underbody rust prevention, I would probably apply an aerosol Cosmoline product myself every few years.

 

Never have rustproofing done by any company. It could create more problems for the undercarriage and actually cause some areas to be prone to rust. Today's cars don't need rustproofing because of the quality of steel used and the primers and paint coats that are used. Technology has come a long way in this field so save your money and wash the car weekly.

 

I have some faith in the new technology used in manufacturing’s today’s Cars. Despite having had a 76 Alfetta GTV, which must’ve been Italian for “metal rot”. I think Italians realized that the theory of driving a car like you planed to dump it tomorrow, will not bring back customers. WHen you see how they drove in Naples, you realize the last thing they’re worrying about is a small spot of rust.