Your car is galvanized which acts as a sacrificial anode and will take care of rust for quite some time, especially in a dry and not very salty place like Calgary. If you are keeping your car for over 10 years, go for it. Otherwise you're wasting your time. Personally, if I have a 10 year old car, I don't really care if its rusting a bit as it's worth next to nothing by that point anyways.
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