In any case, put a piece of painters masking tape around the area. Also, use a center punch first (after taping) so your bit doesnt wander. Use a sharp bit and spray some canola oil on the end of the bit to keep the heat down. Drill slow rpm for metal. The tape helps hold the PC down around the hole. DO check with your powdercoater to see if they have any other tips. I feel your pain, doing any drilling on fresh paint is always high pressure.
