I used 5 minute epoxy to glue the discs together. I set the assembled disc on top of my dremel with no collet and ran it at a low speed and while it was spinning lightly touched it with 220 grit sandpaper.
I used zero paints. I had to strip it down and redo it. Zero paints are very hot and the tamiya peimer didn't provide enough barrier. Plasti cote fillee primer works. It is a 3 stage lamborghini color.