There are a good number of instructables for painting the Xbox 360 and accessories, but none that focus on finer customization of the controller Guide button. If you're going for a truly custom look, the guide button is one component that is often overlooked. There is obviously a bit more going on in these project pictures, but I will just be focusing on the Guide Button here (with a small tangent for doing the same to another piece of the controller).
Step 1: Prepping the Part(s)
The metal already has a bit of texture to it, but to ensure the best possible bond, it is a good idea to rough it up some more with sandpaper or otherwise score the surface a bit. I just used an X-acto knife and scratched it up good.
For this project, I was also putting custom lettering on the piece between the shoulder buttons which has a recessed Microsoft logo on it. That needed to be filled as well. The prep procedure is the same, but I used sandpaper to rough up that piece just a bit.
When the parts are ready, mix up a little bit of your favorite body putty and head to step 2.
Step 2: Covering Up the Existing Design
Or, you can build it up really high and do some interesting sculpting with the top of the button in the next steps. This project called for a nice smooth top, so we'll go with that.
For filling in the lettering on the controller piece, do the same thing and then scrape off any excess putty to save yourself sanding there as well. Let it set up just a little bit first and then carefully scrape it off with a knife.
Step 3: Sand, Shape and Smooth
Once the putty has fully cured, it is time to sand everything down. Use a fairly fine grit paper and go somewhat slow. You want to get as close as possible back down to the metal, without actually sanding all the way through. You also need to be careful to make sure everything remains symetrical so the button doesn't look lopsided when all done. If working on the logo piece as well, just sand it down until there is only putty left in the lettering and the rest of the plastic is clean.
Step 4: Prime and Paint
A couple coats of primer, followed by a coat or two of color and finished with two or three coats of clear will do the trick. I did a light wetsanding between all coats.
Step 5: Finishing Touches
For this project, some custom decals were printed and applied to the top of the button and the front of the controller.
As a bonus, the LEDs were swapped for red as well. :)