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Old 09-15-2008
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Consider..

Consider creating a mast base bilge sump. We have one on our boat and it is one of the best features. All the rain and fog moisture gets trapped in the bilge sump and I suck it dry with a turkey baster after a big rain..

Expandable foam six feet up a mast will be a ROYAL PITA in the future if you need to do any sort of repairs or re-wiring. Sealing around the wires will also be very difficult to do at at even a 80% success rate let alone 100% dry..

Again, the mast sump keeps the rest of our bilge at dusty dry levels along with the PSS and dry non leaking deck fittings and no domestic plumbing leaks...

I remember reading a while ago on one of the forums of a guy who bought a boat where the PO had injected expanding foam and of his resulting cuss words and headaches associated with trying to run a new radome wire. Oh and if I remember correctly his mast still leaked into his bilge.
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