Just refurbished and installed my old data plate. �I think it turned out pretty nice.
Before:

After:

I scrubed it then lightly sanded the crud and rust off with 600 wet sand paper. I taped off the edges and the serial number box.
I spray painted the rest in black and let it dry completely.
I then use 1500 wet sand paper and a small block, working in small sections and slowly and gently sanded the black paint off the raised lettering. �It took about an hour worth of sanding. �
Tim