What is done when it is "rust proofed"?My 2009 silverado is 14 years old and I live in Canada and we get lots of snow in the winter and they use lots of salt on the roads. Even though I have a garage, for the last 4-5 years it has been outside year round. For the last 14 years, I get it rust proofed once per year and I wash and paste wax it every spring and fall. The finish looks almost new.
They spray an undercoat (called "crown" undercoating), under the vehicle and in the body panels that puts a thick coat and prevents rust. Over the years I have used several undercoating companies and this one seems to work the best. VW will void your vehicle rust warranty if you use a undercoating. I had a 2010 diesel golf wagon (they bought it back from me because of dieselgate in 2017), which had a life time rust warranty (except for surface rust). Before they bought it back, they replaced the rear hatch twice and did extensive body work on the car. I belive they only have a nine year rust warranty now.
