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      10-28-2025, 08:11 PM   #1
fe7565
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Should I be worried about this what looks like rust ?

2012 car, garaged, DC area. To me it looks like rust, but I’m not 100% sure if I should take it down to the bare metal, prime, and repaint it. This is in my engine compartment front area.

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      10-28-2025, 08:29 PM   #2
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Doesn't look like rust. Try with the plastic knife to scrape it off.
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      10-28-2025, 08:51 PM   #3
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I took the photos shortly before I posted them, and I didn’t even look at them up close. Now that I could see them on the big screen, I think you are correct. This is some sort of a liquid dried on it.
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      10-28-2025, 09:22 PM   #4
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Definitely not rust.
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      10-29-2025, 01:11 AM   #5
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that's most likely cosmoline.
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      11-06-2025, 08:38 PM   #6
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BMW coats the inside of the hood with that stuff, on a hot day it drips out and makes a mess.
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      04-28-2026, 04:27 PM   #7
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Just to close the loop on this. It was just some deposit from the cleaning stuff I used that accumulated and then got baked on due to under the hood engine heat. Came off with little effort.
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Last edited by fe7565; 04-28-2026 at 04:35 PM..
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