Quote:
Originally Posted by Tcoat
Surface rust can easily be stopped just by sanding it off and coating it so that moisture can no longer get to it. Rust from behind or integral to the metal (almost unheard of now) is the stuff that can't be stopped easily.
Just sand it and coat it and all will be fine.
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I wish I could agree with you, but it just hasn't been my experience. I let a small paint chip go for a year or so on the door of my '93 325i. Once the spot started rusting and the associated blistering had grown to about the size of a quarter, I sanded it down to what looked like bare metal, used a little spray-on "rust converter" of some kind, then primed and painted it. Within six months the rust was back worse than ever. Same story on a couple door dings on our '99 ML430.
There's a reason body work shops, at least in our area, will not warranty any work done on rust. POR15 is the only stuff I've found that will stop it. I live in the Lake Ontario lake effect snow belt (actually, just slightly below the worst of it, but we still get hit a LOT) and they use a TON of salt here. Maybe it's not quite as bad, salt-use-wise, up where you are, T, and that could explain our different experiences. If your area DOES use a lot of salt, too, then I'm not sure how else to explain my bad luck with rust compared to your experiences. If I recall correctly, I don't think either one of us are particularly diligent when it comes to washing our cars...
Yes, modern cars do MUCH better with rust prevention than cars did a few decades ago.