i painted the rb25 one midight purple ii before i sold it.

took it off, (keep rubber gaskets in a sealable bag or whatever)
then i used paint thinners or white spirits to clean it down with a cloth, then i sanded it to remove any grit and oil, till i had it fairly cleaned down.

then i just primed it grey with 2 or 3 coats then painted it with the purple spraypaint i had made up from the code.

then one or 2 light coats of clearcoat (lacquer) to give it a shine.

job done