Update: DeMac recommended this: Birchwood Casey Aluminum Black Metal Finish (thank you, DeMac!)
It worked well, but given that my windows were already installed and wasn’t going to remove them again, it didn’t work for me. It took several coats and some soaking and I went through a whole bottle on a couple windows. DEF recommend it for smaller projects, though.
I used rust oleum in matte black. I can tell that some of the windows are sticking a bit, but I think that will get better with time. So far, so good!
Thanks F04 and musigenisis for your suggestions!
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