You can do it if you have projectors for your hids- which is the correct way to run hids, that's how they were designed to be utilized, not to be out in a reflector halogen set up.
If your running hid bulbs in a halogen reflector headlight, which is what most people do because their misinformed/ then no you can't paint the reflector (chrome housing ur taking about)
I did a full on hid projector retrofit, see the link in my sig for details. You might want to do as I did, it's a 200 times better than running hid bulbs in halogen reflector housings.
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