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Put your kayak on a stand. Fill the kayak with a few inches of water and add some phenol red (available at any pool supply place). Tilt your kayak in various directions until all areas of the hull have been under water for a test period. When you find the place with the leak, it will show up red the outside of the hull. This test will probably not be very good for finding leaks in hatches but it should find any cracks in the hull.
This chemical is not harmful and the color will disappear after a short while. You could also use food coloring but that is a dye that will stain anything it touches. Phenol is much better.
Bob
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