Is it bad to paint the metal plate inside a console?

anything bad happens if you use sandpaper or use dremel wire brush to remove oxidation on the metal plate on a console and then paint it with spray paint?

( i am NOT sanding and painting the heatsink and the area where thermal pads are placed.)

I am asking this because on the borders specially, it is where it touches the console motherboard, and the PCB is ground on the border too, so if i sand down the border of the metal plate and paint it, can anything bad happen to the console after?

https://preview.redd.it/9ujandu1llxd1.jpg?width=796&format=pjpg&auto=webp&s=5da234071ec0949a47c75aeeb39bbb82cc06932e