I know this question has been asked before;

82 240D, Rust underneath the doors and behind the corners on the front fender, where the bumper is screwed on.

How do I treat it? I've got a can of bondo and a bottle of rust remover. I want to at least slow this S*** down before it makes the car look like a complete wreck.

I used the search but I got page upon page of unrelated info.

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1982 240D.
My name is Michael, and I am an 18 year old binge-drinkin', cigar-smokin', novel-writin', all around unsavory and unnattractive guy. I tell long-winded stories, and I only shave once a week, although I've had to do it every day since I was 16.

Go to therustdoctor.com and read ,,,,

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'87 924S
'81 280SEL

Sold ->

81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."

Really depends on how much work you want to put into it. The best way would probably be to sandblast the areas and weld in new metal. That's a lot of work though. Barring that you can try something like what Austin85 mentions or other popular treaments like POR-15, http://www.por15.com/. Note that if the rust has eaten all the way through the metal your options are more limited than if it is just surface rust.

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1999 SL500