I agree with Scott. Fiberglass (or any other synthetic cloth) that has been completely impregnated with epoxy should not leak. Many composite boats are not gel coated.
I think you either have small cracks that might be difficult to appreciate, or some of the fabric has broken away from the cloth fibers. Either way, I would do more than just re-gel coat the area.
Have you tried to examine the interior of the boat at the area of damage? If you can do this and see light colored lines or light colored areas it is an indication of cracking or delamination of the fiberglass. If you have a hatch that allows you access to the interior of the boat where it is damaged, I would put a patch (fiberglass or aramid or carbon fiber) over the damaged area which will restore water tightness and strength.
If you can't do that I would at least thoroughly sand the area of damage, clean it well and apply some epoxy over it before re-gel coating.
Canoe / Kayak Anchors
Recreational Kayak Paddle
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