rust - PeachParts Mercedes-Benz Forum

adiaw83 · #1 04-28-2002, 04:28 PM

a while ago someone or something hit my 300SD in the rear upper rught corner of the car. I was able to easily bang the dent out from inside the trunk but now, there is rust where the dent was. I have touch up paint from MB but I need to kill the rust first. What should I do?

#2 04-28-2002, 06:16 PM

There is a product on the market called "Corroseal". I have used it for years with fantastic results! You paint it on with a brush and let it dry. It turns the rust BLACK. Then you can paint over it with body color. It is great for undersides of cars and places that are hard to get to.
Search "Corroseal" for your closest supplier.
g/f

adiaw83 · #3 04-28-2002, 09:41 PM

I've seen this product before. My only question is does it stop the rust from developing and spreading?

adiaw83 · #4 04-30-2002, 01:03 PM

anyone?

Ridge · #5 04-30-2002, 05:38 PM

Regarding your rust problem, I've used a product by SEM called Rust Seal 39308 for some years now and really like the results. This particular Rust Seal doesn't need anything else once it's dry. You can paint or "Bondo" right over it and it says so on the container.

If you used any of these type sealers, don't put any remaining sealant back in the original container once you're finished, it'll ruin all the container contents.

Follow the dry time recommendations and apply two coats.

Any good auto paint store should carry it.
Ben

adiaw83 · #6 04-30-2002, 05:48 PM

ok thanks, I assumethis stuff spreads the rust from spreadig right?

190D22 · #7 04-30-2002, 07:48 PM

Hey I have some rust that I am little worried about. I have a pretty good sized bubble on the passenger door and I have some rust that is visible with only the trunk open right near the window. There is also a pretty good patch on the inside of the driver's door at the bottom on the edge of the door with the wires and what not. Would that stuff you're talking about fix these? How would you suggest I fix them? New doors? I've though about doing this, but it'd be tough finding TWO front doors of the same color and age with no damage or rust... Any thoughts would help! I have a picture attached of my rust spot on the passenger door.

Ridge · #8 04-30-2002, 09:24 PM

Gentlemen,

The Sem product that I mentioned will stop the rust dead, dead!!! Regarding the rust shown in the Pix of the 190, it is necessary before using Sem Rust Seal to scrape or wirebrush away all the loose rust scale. Then do the thing. After those ugly rust bubbles are burst, scraped and sealed get some good auto paint store "bondo" and fill in the resulting holes. Be careful not to get bondo all over the existing paint.

Then degrease the paint all around the filled area and sand down the bondo using finer and finer wet and dry sandpaper, with water. You have to degrease the area to prevent "fisheyes" in the paint when you spray later. Finish up with wet 1500 grit paper and then spray the bondo patch with a good lacquer paint matching the body color. Build the paint up above the surrounding surface with lots of coats.

Once the paint is dry, sand down the patched area with wet paper and a sanding block until you just reach the height of the surrounding area. finish up with the 1500 paper and water.

Rinse the area with water, dry off and buff up area with a very fine polishing compound. You won't be able to find the patch.

Don't be afraid of making a mistake. With lacquer, you can always do a makeover. It's very easy to work with. Try to spray an area that stops at a chrome strip or a body panel crease so the slight difference in paint color, if any, won't be detectable.

Matching paints can be found at: www.themotorcompany.com. Just give them your paint color number and ask for the lacquer equivalent spray paint in a spray can.

Good luck.

Ben

Ridge · #9 04-30-2002, 09:28 PM

190d22,

I forgot to mention that you'd probably want to pop off those trim strips pictured near the rust before you start your repairs. You'll probably find, like so many of us, that there's where the rust actually started, under the trim. In fact, I'll wager that you'll find so much gunk there that you'll want to remove and clean under all the other trim as a preventive measure.
Ben

190D22 · #10 04-30-2002, 09:37 PM

Thanks a lot! I will let time pop the bubble and take it to my trusted body shop. I am friends with the guy, and he spotted my aunt's repaint on her P.O.S. hyundai that he said was really poorly done. He repainted my sister's grand cherokee... beautiful job! Will my paint be difficult to match? Thanks again for the reply!

#11 05-01-2002, 09:48 AM

The rust killer I have used is called osphoric acid (spelling may be off), ospho for short. I would imagine that all of these mentioned are of the same basic solution. It really works good. make sure that you clean the exfolialted bits and chunks away so when you "kill" the remaining rust you have a good surface to work with just like Ridge has spelled out .

schooner · #12 05-01-2002, 10:35 AM

i have had some good results with a product called "rust mort". For some reason the paint pealed off the roof of my old bmw and litterally there was more rust on the roof than paint. I used a surface grinder to take the paint and surface rust down. Then i used a wire wheel on all the rusted spots to get out any loose bits of rust. THen I painted the rust mort on to the rusted areas. I let it dry and then recoated them. Any place that there was pitting, i used either bondo (very, very thin) or scatch filler compound. THen I primed, sanded and painted. Seven years later ther was no reoccurence of rust on the roof. Good luck, because that rust stuff is pretty insidious.

adiaw83 · #13 05-01-2002, 08:35 PM

thanks for the info. I've also got a pretty bad spot near the bottom rear of the rear door sill I'll try and ger a pic.