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Registered
Join Date: Aug 2000
Location: Palm Beach, Florida, USA
Posts: 7,713
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Yes, go to Home Depot and ask for low expansion CLOSED CELL expansion foam with as small of a tip as they can find. Closed cell foam is a water barrier. Open cell foam absorbs water. Open cell will cause problems.
Stick the nozzle as far back as you can and fill the whole thing. Some will expand past your opening but that's ok. Don't try to wipe it up while it's still liquid. Let it harden a little and shave off the excess with a knife.
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