Use dremel to bevel the fiberglass so there is a sloping edge to it.
On smaller holes I use a syringe to inject the thickened cabosil as deep as I can into the hole then cover with tape till it cures. Remove the tape.... sand and apply system 3 quick fair.
On large holes first clean the hole with acetone. Then coat the inside of the hole with a good coat of resin...then bury the pencil like "Gofast" said but make sure you first inject some cabosil into the hole and then coat your pencil with cabosil to ensure that there are no voids..... then bury it! Tape it till cured then sand and do the quick fair over that.
Or what ever else works as I'm sure there is more then one way to fill a hole.
Happy Thanksgiving BTW
strick
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