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Thru Hull Sealer?
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yooper
#1 Posted : Thursday, May 08, 2008 2:19:22 AM(UTC)
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I took off my old thru hull depth transponder. I expected it to be caulked in with a hard drying glue like caulk like 4200 or 5200. What I found was a materiel formed into white rubber gasket. It was still flexible and water tight after 20 years. Cleanup with a putty knife was easy. I would like to replace most of the other thru hulls and would like to use this stuff if I could find out what it is. Any idea what it might be?

Also, what are the best thruhulls? I have had a bilge pump outlet break off in my hand as I was replacing the hose.
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dougrose
#2 Posted : Thursday, May 08, 2008 3:54:09 AM(UTC)
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Don't know what the goo was, wish I did.

Bronze is best for thruhulls, but of course not for us. Marelon is pretty strong and I doubt that it would break off in your hand. For best strength and twice the bux you can get stainless, which I like. http://store.hamiltonmar...om/browse.cfm/2,607.html


1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida
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jralbert
#3 Posted : Thursday, May 08, 2008 4:17:28 AM(UTC)
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Doug: Given the choices, I'd go with Marelon because it has no galvanic issues and is tough enough to be frequently recommended by the Boat US insurance people.

Yoop: As for sealants, 4200 is a flexible, "non-permanent" choice. I'm pretty sure it's ok to use underwater.
Joel Albert, Potomac MD
"Charlie B" - 1988 32' FBS
Twin 318's/FWC/16x15 nibral props
docked Deale, MD
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