When drilling into a fiberglass body with fresh paint or not, The best solution is to use a brad point bit. These are used in woodworking and they have outer spurs that score (cut a scoring mark in the outside diameter of the hole before the bit begins to clean out the center). Be careful there are some cheap brad point bits that don't work very well. Look for a good quality bit from a woodwork supply place. Don't confuse the brad point bit, which is round and has spiral flutes similar to a steel drilling bit, with a spade type bit which is flat but also has the scoring spurs on the outside diameter. Try the site below. Go to "Drilling" then "Drill Bits". You will se an explanation on brad point bits.
Paul
http://www.leevalley.com/wood/index....D=&ccurrency=2