Brake Dust rust??

K

kstough

New member
Hi! I do not know much about cars and was horrified to see some rust spots on my paint! 2007 Chevy Tahoe. These spots started showing up slowly only on driver side door and now on all 4 doors in a matter of weeks. They have also grown in size! Curiously enough, these spots are ONLY on the top part of the panel/strip on each door. I don't know how to better describe this place, but maybe you can tell more from the pics. What is it and how can I fix it? Will painting over do the job or will it continue to grow and come through the paint? Claying?? Help! :wall
 

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Not on the wheels. the only couple things I can think of : we recently needed new brakes. I noticed the first several spots before the new brake pads. I also work directly next to a small airport's runway.
 
My best friend's white Mustang does the same thing. Clay always does the trick. Its really more of an eye sore than a catastrophic disaster. He changed brake pads and it helped, but it still does it.
 
There is something about that GM trim that attracks these mold spots. You really have to stay on top of them or they become ridiculously hard to remove. Try a good cleaner wax after you clean and clay
 
UPDATE: I tried claying but was unsuccessful. Then, I ran into someone knowledgeable who took a look at it and he said it looks as if the rust is under the clear coat. The trim must have gotten compromised from behind (where it meet the car door) and the rust is coming from the inside out. He suggested painting over it and said the rust should not come through since it is under the clear coat. Does this sound accurate? I have bought paint and clear coat, also have primer on hand for other paint touch up jobs (chips that go through to metal). So, do I just need to clean well, tape off/protect the area, then spray paint color, wait, spray with clear coat? That's it? I don't need to start off with primer or do anything that would help the new paint color stick to the old clear coat? I want to make sure I do it right the first time so I do not have to get a professional auto detailer involved.
 
kstough said:
UPDATE: I tried claying but was unsuccessful. Then, I ran into someone knowledgeable who took a look at it and he said it looks as if the rust is under the clear coat. The trim must have gotten compromised from behind (where it meet the car door) and the rust is coming from the inside out. He suggested painting over it and said the rust should not come through since it is under the clear coat. Does this sound accurate? I have bought paint and clear coat, also have primer on hand for other paint touch up jobs (chips that go through to metal). So, do I just need to clean well, tape off/protect the area, then spray paint color, wait, spray with clear coat? That's it? I don't need to start off with primer or do anything that would help the new paint color stick to the old clear coat? I want to make sure I do it right the first time so I do not have to get a professional auto detailer involved.
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This person you speak of doesn't know what they are talking about. The strips are made of plastic, so it would be impossible for them to rust. Besides, painting over the defect would be the hack method of doing things

Why don't you just try and wetsand them out before going thru the trouble of painting?
 
Trouble said:
This person you speak of doesn't know what they are talking about. The strips are made of plastic, so it would be impossible for them to rust. Besides, painting over the defect would be the hack method of doing things

Why don't you just try and wetsand them out before going thru the trouble of painting?
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Sorry for my ignorance, what exactly would wetsanding do? Do you feel the rust-colored spots are within the clear coat rather than under? What do you think these spots are if they are not rust? I am considering putting chrome trim completely over the existing trim if it will look good/save me some time...:surrender
 
kstough said:
Sorry for my ignorance, 1)what exactly would wetsanding do? 2)Do you feel the rust-colored spots are within the clear coat rather than under? 3) What do you think these spots are if they are not rust? 4)I am considering putting chrome trim completely over the existing trim if it will look good/save me some time...:surrender
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1) Wetsanding would remove the spots more then likely

2) Well, there is NO WAY the rust is under (we've already covered this ground) so I would say within, possibly embetted into the paint. Can you feel a bump if you rub your finger across the surface?

3) Honestly, I have no idea what the spots could be without looking at them and even then might not be able to tell you

4) :yikes:
 
If it is indeed rust(looks like it)you need to completely sand that off before painting ,otherwise it will grow back.

If these are plastic peices you need special paint for plastic or add a flex agent otherwise in time the paint will start to crack.

They make special primer for plasic too.
 
The first thing I would try is a dedicated iron oxide remover such as CarPro Iron-X.

Can you feel the texture of the rust.

I agree with the above. If you paint over it with out removing the rust then the rust will come right back.

As far as painting, you want to remove the rust first, then use a primer, then use the base (color coat) then top with clear coat. Be advised that unless you know what you are doing it is not going to look good and you are going to have a lot of dust in the finish.

Also make sure you take your time and mask all of the surrounding paint and trim off to protect against over spray.
 
I agreed with Todd, but when using a primer you must use one for Automotive plastic, then come beck with a spray that matches your color for automotive use. Make sure everything is cover or your get overspray on your car.
 
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