I've done a ton of stuff with retr0brite. Have a look to give you an idea of what to expect:

Apple Scribe Printer

M2115 External Drive

SE Keyboard

Apple //c

Floppy Drives

CH Products Joystick

Mac Color Classic

Pro Keyboard

80SC External SCSI

You'll be glad you didn't paint it. You can find the Oxy Clean powder at pretty much any grocery store. You'll find the peroxide at any solon/hair care supply store. I use vol 20 and it works great. It's only $5 bucks.