This is a great mod if you are unable to find aftermarket headlights for your car or if you are on a budget. It makes your car look more aggressive and gives it a stealthy look. Aftermarket lights aren't available for my sx4 around here, so I had to make my own.
First you need to remove your headlight assembly from the car. Carefully remove all the bulbs from the assembly, then remove all the bolts and clips holding it in place. In my case I had to remove the front bumper to access all the bolts. If you don't need to remove your bumper, you can skip to the next step. Removing the bumper is just a matter of finding all the bolts and clips holding it in place. In my case I had bolts on top, in the wheel wells, and under the car. There were two clips in the wheel wells to remove. Once all the hardware is gone, carefully remove the bumper. If you have fog lights, be sure to disconnect them first. Once the bumper is removed, you can remove the last bolts from the headlights, and remove.
Next you'll need to open up the headlight assembly. You'll need to heat up the glue sealing the headlights and gently pry apart. Some guys put their lights in the oven at low heat around 200 degrees for a few minutes, I didn't trust that so I used a heat gun on low setting. Work in one section at a time, heating and prying until it pulls apart. I found using an old butter knife worked best for prying.
Once open, you can tape off the areas you want to leave unpainted, such as the reflectors behind your headlight bulbs. Once masked off, give it a good cleaning. Wax and grease remover is recommended. Let it dry and then use a microfibres cloth to remove any lint and residue.
Now you are ready to paint. There are a few different methods, first, you can sand down the area you wish to paint, clean it, prime and paint. This is recommended if you want to use a different colour than black. I wanted a black chrome look, so I used VHT Night Shades directly on the chrome to achieve this. It's a very durable paint normally used for tinting tail lights, but it bonds to any smooth plastic surface. Only use night shades on a smooth surface. It will not bond properly to a textured surface and you will need to start over.
Once dry, you can unmask your housings and reassemble. Pretty much reverse what you did taking them apart. If the lights are still fairly new, you can reuse the sealant still on the light assemblies. It will bond back together when heated up again. If you wish to replace the sealant, I recommend using a butyl tape sealant. It's easy to use and leaves no mess. Once you have the assemblies together, use a heat gun on one section at a time and squeeze the assemblies together with either a clamp or I carefully used pliers. Then they are ready to reinstall on the car.
This is the way I did it and am very happy with the results. If you want to get headlight work done professionally, I highly recommend Winnipeg HID!
Note: keep a close eye on your lights for the next few weeks, if you notice moisture starting, you will need to reseal them. An easy way that I've seen to reseal without taking everything apart again is to use a window sealing caulking and use a syringe to apply it. This makes it a lot more controllable and leaves minimal mess.