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Compass Marine How To | all galleries >> Welcome To >> Sealing Deck Penetrations to Prevent Core Rot > Brad Point Drill
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Brad Point Drill

Brad Point Drill

When drilling into fiberglass the proper tool is a must. This is a brad point drill and it will create a clean, no chip hole in gelcoat provided you use a few tricks.

The main trick is to always start the drill in reverse! This trick also works well with hole saws. By starting in reverse it allows the outer cutting edges of the drill to cut cleanly through the gelcoat. Once through the gelcoat you can then switch the drill to forward and complete the hole without chipping any gelcoat off the surface.

Nikon D200
1/60s f/3.5 at 70.0mm iso100 full exif

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Guest 18-May-2010 15:44
All these years of gelcoat chips and I'll I had to do was reverse the drill! None of the boat repair books ever mentioned this tip.
Bruce 22-Nov-2008 18:01
Great tip! I would have never thought to run the drill backwards. I will try it on my next project.