Pali, for his 6x17 3D-printed camera, recently started using spraypaint made for simulating a chalkboard service. Seems to work well for him. I am going to get some for my Mercury 2x3 camera which has some reflectivity issues with the widest lenses.
Edit:
Possibly this one
https://www.amazon.com/Krylon-I00807...dp/B001DJ1VCS/
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