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William R. Watt
 
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Default epoxy does so pass water

The owner of an epoxy sheathed plywood (okume marine) kayak was showing me
today the deterioration in the surface ply on the inside of the hull. The
builder had let the boat sit outside over the winter mistakenly assuming
epoxy was impervious to H2O. Snow accumulated in the cockpit, melted,
froze, melted again, and by late spring there was 6" of melt water inside
the hull. The epoxy sheathing on the inside of the hull did not stop the
water from getting at the plywood and starting rot. Accept the claims of
epoxy purveyors and promoters at your peril.
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