(Hanover, PA, USA)
With a boat which has been laid up for the winter, it's a good idea to have some sawdust and a broom on hand.
After the boat is in the water, cast sawdust onto the surface and sweep it under the boat with the broom.
Any water finding its way inside will carry some sawdust with it which will enter the seams and swell thereby slowing the flow of water.
This will give the boat planking an opportunity to swell and cut the water off.
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