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Drill hole or saw hole

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  • Drill hole or saw hole

    Hi. I’ve been reading a lot and watching a lot of videos on fiberglass repair, because I might be doing some. I’ve never done it before, so I’m gonna practice on an old boat that I had no intention of ever using. There are some clean drill holes in the practice boat. Would I need to sand those down so that the hole is more tapered down, or could I just go straight ever a hole like that? If I need to taper it down, how far should I go.

    Same me question for a circular saw cut. Go straight over, or taper it down?


  • #2
    Well, that's kind of a loaded question. It really depends on what you're hoping for in the finished result. You can absolutely "repair a hole" by sealing and covering it. That doesn't, however, mean you won't always see it and have your eyes drawn to it. I was watching the Crab Fishing Show on TV and they had to weld a patch on the hull to stop water from getting in. Looked like crap when they were done, BUT, no more water intrusion.

    Now, if you're after a nice looking finished project, then you're better off to grind everything down to a taper so your repair won't be noticeable after the color coats are one. You can simply angle your circular saw blade to help that process along when removing large sections of say the decking.
    "If it ain't broke....don't worry, 5 minutes with me and it will be!"

    1988 Sunbird SWL 200 - Evinrude 130 hp Looper
    1996 Trophy 1802 - 120hp Force (SOLD)
    8' Hardbottom Dinghy w/Evinrude 6hp OB (ALSO SOLD)
    Always In the market for nice, local area, sailboat, with the operative word being-"cheap"


    • #3


      • #4
        For the most strength, you always taper both sides and lay in the glass, starting with the largest piece and progressively smaller diameter peices till the hole is close to filled. How far to grind? Till all broken glass id gone. Then a couple inches to create the taper.
        If ya can't fix it with a hammer,ya got yourself an electrical problem.


        • #5
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          I filled in many 1-1/4 holes when I restored my boat. Feather the edges back an inch and build up in layers

          I also fixes some O-carp holes.

          If you are practicing, take a holesaw, and make some holes

          And then take an axe and a pick-axe and make some holes

          Then fix them so they are no longer visible
          Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

          1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

          Past Boats
          1970 Wooster Hellion - Merc 9.8
          2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
          1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

          What’s behind you doesn’t matter.Enzo Ferrari