Agreed, that is the most best way to make sure it doesn't rot underneath.Products like Krown and Rust Check will creep into areas that were not sprayed. That is good but it also does not last. It will be worn off before one winter in many areas and laid on heavy in areas that are not needed. It is for a fact, better than nothing but nobody sprays everywhere it's needed. It's also hard to know where every different car needs it. Either way, any oil spray is better than nothing but nothing beats just avoiding the salt in the first place.
If you truly want to preserve your car, don't drive it. As for undercoating like South Main is talking about, avoid.
How often should I apply it if you don't mind explaining haha? Theres a place that does fluid film spraying near Toronto, so hoping to use them.I'm a fluid film believer. Used it on my old F150 after restoring it and none of the rust ever came back even after driving it through a couple PA winters. I use it on my tractor, snowblower and all of the implements before I store them and they always look like new when I go to use them again. I wanted to do my new F150 with it before winter but just didn't get around to it. Eventually I'll coat it.
It does need reapplied occasionally and it is messy, but if keeping rust down is your goal, it works well.
How often should I apply it if you don't mind explaining haha? Theres a place that does fluid film spraying near Toronto, so hoping to use them.
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