The brass can do like this maskant
The Purple sample is perfect, that dark purple is beautiful!! Amazing job, Exclusive!
I think all the Purple choosers made the right choice!
But no textured brass please. Smooth aluminum + textured brass is messy.
I'm not sure how difficult PVD coating would be, but I think that would be preferred. Maybe two options, one for those who want PVD coated brass, and an option for those who want raw brass?
I'm not to familiar with other possible long lasting coatings, but in the end I personally wouldn't want textures brass like the sample you showed.
Edit: Are there any other long lasting options to prevent brass from tarnishing?