Stubborn streaks on black paint

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bmwstephen

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So my boss, has a black 2011 m3. After parking his car over the weekend at an airport a few months ago, he came back and saw these streaks or residue. After a light detail (wash and clay), they still remain. Any insight peeps?

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That looks like cracked paint, that cannot be fixed

Sent from my SPH-D710 using AG Online
 
Hard to say there. If it was clayed correctly, it unlikely they are surface bonded contaminants. However, this wouldn't be the first dude to leave his car at the airport and come back to find some mystery stains on it. It could be something leaked from the parking garage or it could be anything.

Was it clayed correctly?

Did anyone try a baggy test on the area to see if they can feel these contaminants?

It's hard to tell from the picture if it's on the paint (contaminants) or in the paint (scratches - like some jesmo drug his suitcase across the hood).

If it's on the paint, I would try re-claying just the area and possibly following up with a tar remover or some light mineral spirits. That should take care of most things on the paint. Another approach is to try to compound them out by hand using a MF towel - but that usually doesn't work too well.

If they are scratches, they look like they COULD BE deep enough to require some wet sanding. Of course, this should be done only by an experienced detailer with a PTG.

refreshauto said:
That looks like cracked paint, that cannot be fixed

Sent from my SPH-D710 using AG Online
Click to expand...


I agree. That's what thought initially. But, you usually only see that on plastic bumpers that have been hit/flexed. It looks like it's on the hood and there doesn't seem to be any sign of an impact. I dunno though. Hard to tell... You could be right.

Is it on the hood or on a plastic bumper?
 
My thought is that this is stained paint from some kind of liquid spill that is more than just plain water.

If a light wash and clay didn't work then you are going to need to progressively move to more aggressive steps.

1-Pre-wax cleaner (Mother's Pre-wax cleaner, Pinnacle Paintwork Cleansing Lotion, Wolfgang Paintwork Polish Enhancer, etc...)

2-A medium to heavy polish (then a compound if that doesn't work), preferably Wolfgang or Menzerna if you have a DA polisher or any good quality polish with a rotary. Some spots should definitely come out after this step but be prepared for a wet sanding activity should some spots remain.
 
mwoolfso said:
My thought is that this is stained paint from some kind of liquid spill that is more than just plain water.

If a light wash and clay didn't work then you are going to need to progressively move to more aggressive steps.

1-Pre-wax cleaner (Mother's Pre-wax cleaner, Pinnacle Paintwork Cleansing Lotion, Wolfgang Paintwork Polish Enhancer, etc...)

2-A medium to heavy polish (then a compound if that doesn't work), preferably Wolfgang or Menzerna if you have a DA polisher or any good quality polish with a rotary. Some spots should definitely come out after this step but be prepared for a wet sanding activity should some spots remain.
Click to expand...


:iagree: I'm also inclined to try this approach. At this point the damage is already done but I'd still use caution and proceed slowly...
 
mwoolfso said:
My thought is that this is stained paint from some kind of liquid spill that is more than just plain water.
Click to expand...

I agree for the top picture. Looks like some type of topical staining and any paint cleaner, fine cut polish or one-step cleaner/wax should remove the stain and restore a clear clearcoat.

The second picture looks like cracked paint.



:dunno:
 
Before you get to aggressive do you have a paint meter and was the car ever repaint there?
 
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