This is not meant to be a deterrent for anyone to do this, I would do it again in a heartbeat. If you are one of the poor souls like all us Canadians that have DRL's I have discovered a rather nasty issue with painted headlights. It appears that the heat from the ballast (which sits right under this area) will cause damage to the light under the turn signal. The heat must get trapped between the ballast and the paint. This most likely happens on really hot days in the summer combined with the fact our hid's are on all the time.
I originally thought it was just paint bubble, not a big deal. But it appears that the heat is high enough to cause the plastic to bubble. The housing on the left has been sanded significantly more then the one on the right to show the damage. The one on the left will still require more sanding as what you are seeing is pitting.
I am going to try a heat resistant material on the underside of the shroud this time after I finish the repair. I would suggest trying the same thing if you are doing this mod to avoid this issue if you have DRL. Unless someone can finally figure out how to disable the DRL's.