I laid out clear contact paper as a mold release. Then I used 1/4 inch rubberized weatherstripping for a gasket form. The hatch retainer build process starts with graphite thicken epoxy over the weatherstripping to ensure a smooth transition for eight layers of 4 oz fiberglass. After the epoxy was set, I removed the waste weatherstripping and trimmed the part to size. When the kayak is finish, I'll install the finally weatherstripping, which is 3/8 inch thick. The final installation gasket is thicker due to compression of the hatch lip once the buckles are tighten.
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