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#1
11-09-2005, 12:21 PM
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Use "Tiger Hair" Putty or Weld to repair some rust damage.(85 300D).
I've got some rust breakout around the outside edges of my rear wheel wells of my 85 300D. Part of me says try to get it welded, and the other part says just use the Best Putty you can find to repair it. I eventually hope to restore this car to NEW or near new, but cost is a consideration.
PRO's/CONs Welding: I have heard that welding on Mercedes 85 300D is not so good because of high lead content of stelel and in the end you need Putty anyway to finish it... PRO's/CONs Putty: Putty always breaks out in 5 years, which is how long I have had this car. 
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#2
11-09-2005, 12:31 PM
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you have to cut the rust out...if you don't its going to be ten time worse in a very short time....
You treat rust like you would treat cancer.... if the car already has terminal cancer then by all means bondo away to keep it looking decent till its ready for the crusher....
__________________
Proud owner of .... 1971 280SE W108 1979 300SD W116 1983 300D W123 1975 Ironhead Sportster chopper 1987 GMC 3/4 ton 4X4 Diesel 1989 Honda Civic (Heavily modified) --------------------- Section 609 MVAC Certified --------------------- "He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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#3
11-09-2005, 12:53 PM
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I would cut and weld. I have seen jobs done where the rust was cut out and new metal "glued" in, however I would not recommend it.
__________________
Adam Lumsden (83) 300D Vice-President of the MBCA International Stars Section
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#4
11-09-2005, 02:23 PM
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What I've started (and plan to finish soon - really!)
1. Cut out rust (within reason) 2. wire wheel/strip back a little 3. Weld in new steel behind the hole 4. Treat with a phosphoric acid solution 5. Coat the new and pitted steel with Rust Bullet 6. Fill with short strand fiberglass filler to contour 7. Prime, paint, clearcoat and compound I'm at steps 3-4 now, we'll see.
__________________
'82 300SD - 361K mi - "Blue" "Good judgement comes from experience. Experience comes from bad judgement." listen, look, .........and duck.
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#5
11-09-2005, 05:19 PM
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Quote:
I have seen jobs where the rust was cut out and new metal was "glued" in. I was perfectly satisfied with the result, and have been for 3 years. I used Fusor 12B 2-part epoxy on the lower rear corner of the rear wheelwell arch. I "fused" a complex shape of about 5 pieces including flat patches for the trunk floor. I used a very minimum amount of kitty hair fiberglass to get a good contour. You can't tell it from the original. I used it to patch small holes in the floor. I have some much bigger projects in mind for this stuff. The beauty of it is that it does not induce corrosion like a weld would. Rick
__________________
80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)
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