If anything, over time some seepage is the norm if the glass layer has a chance to stay wet for a while, at least in my experience. I did not have this problem on the trip home when I took a hell of a chip out of my NDK boat pulling in for the lunch break, but that boat has a custom layup with extra reinforcement all along the keel line. It is not the normal situation.
Until the last couple of years my husband and I attended a symposium each fall off of Bar Harbor, where there are many island with good shoreline for rock gardening. If we went out with a group of more aggressive paddlers, one would often get caught up on a rock shelf and be spun by waves for a while until the paddler and boat were extricated. The paddler sometimes ended up bleeding from rock cuts, the boats always got punctured to the glass layer here and there. As far as I recall, every one of the punctured spots developed a tendency to seep water, the only diff being whether it started as soon as the paddle home or if it took another day of paddling to start.
I should note that the paddle home in some cases was over two hours. That is a lot of time for water to do its thing.
Sport Cases (Electronics)
Touring Kayak Paddles
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