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#16
04-18-2009, 11:52 PM
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I'd treat the metal with some baking soda and verify there is no acid remaining and clean up the surface rust with a wire brush or rotating wire head on an angle grinder and treat the metal with good quality primer and repaint it.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! 
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#17
04-19-2009, 03:24 PM
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Agreed, no need to cut that out.
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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver 1982 300SD - 232K miles - Wife's Daily Driver 1986 560SL - Wife's red speed machine
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#18
04-19-2009, 11:26 PM
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make sure the rust is not the kind where the metal is weak. poke at it with a screwdriver. if it gives, the metal is beyond repair. but from what the pics look like, it looks like acid that's eaten through the paint and moisture+air created the rust.
if space allows, take a cup brush on a drill to it and take off as much rust as possible. take it back at least 0.5 inches around the rust. Go to HD, get a product called "Naval Jelly" and a metal etch product (there's so many out there, but I can't recall a brand name). Follow the directions for both products. And only THEN do you put primer and paint on it. If you have a lot of this kind of rust, i highly recommend the POR-15 ***system*** and not just the POR-15 product. If you want to make anything last, prep work is everything.
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