Do I have to predrill before running screws into fiberglass - Page 3 - SailNet Community
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post #21 of 24 Old 08-01-2013
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Re: Do I have to predrill before running screws into fiberglass

Something like these should do the trick:

3-In-1 Hex Bit Countersink Tool

Countersink and Deburring Tool Set

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post #22 of 24 Old 08-02-2013
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Re: Do I have to predrill before running screws into fiberglass

If you are trying to use a larger drill bit as your chamfer tool you may end up with a bigger hole. Most drill bits are made to pull in so when you try to just "kiss the edge the drill pulls itself in. Sometime running a larger bit in reverse works but I learned the hard way that on fiberglass/gelcoat a chamfer bit is the only way to go.

my 2 cents

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post #23 of 24 Old 08-05-2013
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Re: Do I have to predrill before running screws into fiberglass

What if you are replacing wood. Is it recommended to re-use the original screw holes (any preparation required?)? Or should I fill the holes and drill new ones?
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post #24 of 24 Old 08-06-2013 Thread Starter
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Re: Do I have to predrill before running screws into fiberglass

I'm not done yet but I am filling the old ones and drilling new ones. I'll reuse the through hole winch holes. I filled all my handrail holes. I did not take them off myself and after reading "this old boat" it says hand rails must be through hole bolts. I'm not sure if mine were or not. If they were I probably would have reused the holes although this old boat says to make new ones.
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