Lots of good advise, none applies to my situation as I have already drilled it and honestly the chip is so small that can not be seen without a naked eye.
I have done the backing it with a piece of wood method when is possible, the canopy is backed by its frame and not possible to back it with a piece of wood. Also a uni-bit will not work with thick material unless you don't care about the size. If one is OK with going to a slightly larger size hole, I highly recommend a Plasdrill, you can get it at skygeek or Tap plastic. It works very nicely.