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Old 07-03-2013, 09:16 PM
FrankSchwab FrankSchwab is offline
MC Devotee
Join Date: Aug 2004
Boat: 1998 Maristar 200VRS
Location: Phoenix, AZ
Posts: 1,685
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.
1998 Maristar 200VRS
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