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 Catalina/Capri 25/250 Sailor's Forums
 Catalina 25 Specific Forum
 Fin Keel growths		  New Topic  Topic Locked
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FrankV
Navigator

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USA
135 Posts
Initially Posted - 03/16/2004 :  17:17:09  Show Profile
We sprung for a bottom job after 4 years. The boat was pulled, and the bottom looked to be in good shape after a pressure washing. Except, the keel has a bunch of growths all over it. There are about 10, 3-4 inches around, and they protrude out a couple of inches. When you hit them with the grinder, they pop into a dust like cloud of rust. Any idea on what they could be, and how to prevent them in the future? The boat is a 1980 SR, fin keel.

Thanks.
Frank Vaughan
250 WK/SR
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Ed Montague
Captain

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USA
499 Posts
Response Posted - 03/16/2004 :  19:04:31  Show Profile
Frank, Sounds like what happens to my cast iron swing keel. I don't know for sure but you may have a boat with an unencapsulated iron keel. I believe that later boats went to lead with a fiberglass covering. I am sure somebody with a fin keel will verify this.
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 03/16/2004 :  20:50:46  Show Profile
Without seeing it.. likely rust bloom from water penetrating to the iron inside of the keel.

Epoxy sealing the keel surface will help prevent further deterioration. I suppose a fully 'bristol' repair would involve stipping, sandblasting and re-fairing the keel (that's a whole bunch of work).

I'd be inclined to just get the surface smooth and put an epoxy barrier coat on.
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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 03/16/2004 :  21:28:24  Show Profile
Clam is right... My '85 is glass-encapsulated lead, but in '80, the fins were cast iron with nothing much more than paint on them. Cast iron can sprout large "rust blooms" without actually losing that much iron. When you remove the blooms, you'll see some pitting, but nothing major. My slightly off-the-wall recommendation would be to sand as much of that rust off as you resonably can, and then coat each spot with a "rust reformer" before putting any barrier coat or other epoxy finish on the keel. You'll eventually get some more rust wherever anything nicks the finish, but there's no great harm in that. You have 1900 lbs of iron down there.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.