Make quick passes, do NOT try to get it solid black in one coat. Unlike spray paint this stuff actually causes a chemical reaction with the plastic, causing the color to be absorbed into the plastic itself (which is why I chose this over regular paint which fades and rubs off fairly easily).

This means two things.

1. If you overspray it will be nearly impossible to correct your mistake properly, as there is no layer of paint to sand down, you will be sanding almost directly onto the original surface.
2. The parts will be vulnerable to damage until they cure. You can literally take your fingernail and scoop soft plastic right off the surface just after you spray them. So BE CAREFUL!

That being said, make a LIGHT pass, hold the piece for about 30 seconds, set it down, do the next piece, hold it for 30 seconds, set it down, rinse/repeat until all the parts have been VERY lightly coated. You should still see plenty of white, this is fine.

Now, start with the first piece again, give it another very light coat. Very light, keep the nozzle about a foot and a half away from the part.

If you smell heavy fumes please, STOP, this stuff will make you very sick, worse than spray paint. Get a ventilator or move to a better ventilated area if need be, don't mess with this stuff.

Once you go through a second coat on all the parts...go for another one. After the third coat you should be down to touch-ups. Make sure you spray along the seams, there are gaps between the parts and if you don't get the seams properly you will be able to see white when you look at it.

Also pay attention to the inner neck of the joysticks, you have to intentionally spray in there (CAREFULLY!), they won't pick up enough dye just from you spraying the surface.

Once you have your third coat and touch-ups done, let it dry/cure for about 20 minutes, then find a well lit area and go over the parts, make sure you coated them properly, make sure no white shows through.

Once you are satisfied, you can reassemble it. Just reverse the steps outlined above in the disassembly.

This is rather simple and there is only one trick to it.

The rumble motors are only secured in place by being sandwiched between the two halves of the controller. But you have buttons in one half, and rumble motors in the other...gravity being the harsh mistress that she is it can be a PITA to get these to play nice.

Tape to the rescue!

Use a piece of masking tape or scotch tape, do NOT use a really sticky kind of tape (duct tape and five are both right out!), and insert the face buttons (back, start, guide, a,b,x,y) into the front half of the shell, then place tape over them, thus preventing cruel gravity from yoinking them out from under you.

Now simply position the rumble motors on the bottom half properly (the two plastic ridges should be about evenly spaced on the insulator wrapped around the motor) and plop the front half of the shell down on top of it, it takes a bit of wiggling to get everything to go happily back together, and a little bit of force too, but don't be hasty, if its not going, don't force it, take it apart and see if anything is wrong. Patience may save you a $50 controller.

Thats it. Simply put the screws back in, let it cure for about 24 hours, by then it should stand up to even the toughest gameplay.

Enjoy your spanky new black controller!