This is the FLD bezel used to center the lights and make sure they look right inside of R2. When making the lights, this goes over the LED before they are soldered to the PCB. This is important to ensure they look good.
Polishing the R2 300mm Dome
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Polishing the dome, I used Brasso metal polish that I got at the Home Depot in the cleaning section. I applied this with a rag and used #0000 steel wool very lightly to do the polishing in sections so it comes to a nice shine and you can see a visible reflection.
Sanding the 300mm Dome
My approach at sanding the dome used #0000 steel wool pads, and I sanded the dome several times until the glossy sheen was gone, but enough to make it still look older. The end result was very satisfying and was enough that I could polish the dome later on and make it shine. Here is the process used for sanding the dome.