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Old 07-03-2013, 08:16 PM
FrankSchwab FrankSchwab is offline
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Join Date: Aug 2004
Boat: 1998 Maristar 200VRS
Location: Phoenix, AZ
Posts: 1,446
Gelcoat is very brittle when drilling, if you don't do it right the edges of the hole will chip while you're drilling, and start spider cracks that will propagate a long way over time.

I was very successful with a step drill, as Aric suggests. Use a small drill, run it in reverse until you get through the gelcoat, then forward through the fiberglass. Then use the step drill up to the diameter you need.
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