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post #1 of Old 09-13-2008 Thread Starter
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Sealing the inside of mast

Hi - My keel-stepped 67' aluminum mast has many halyard openings that invite rainwater and spray into the mast. This drains harmlessly into an otherwise dry bilge. Does anyone have experience with expanding foam or other solutions that would keep the water above deck level? I've thought of inserting a balloon into the mast at deck level and inflating it, thereby creating a plug to keep the foam from running down the mast. Will the foam create a good seal around the wires? Many thanks for your thoughts! Willy
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