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 Catalina 25 Specific Forum
 cast iron keel bottom		  New Topic  Topic Locked
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tbosch
Navigator

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163 Posts
Initially Posted - 05/04/2010 :  10:26:28  Show Profile
I completed a bottom job on my cast iron fin keeled 1980 Catalina 25. Or at least everything I could get to while the boat was on a trailer. The bottom of the keel that sits on the trailer is still bare, but not clean, cast iron. The rest of the boat has 5 coats of Interlux Interprotect 2000E and 2 coats of antifouling paint. The keel actually has fairing compound and 2 or 3 coats of epoxy under the 2000E.

So, should I pay extra to have my boat kept in a sling overnight in an attempt to grind the keel bottom to bare metal and at least get a couple coats of epoxy on it? Or should I just not worry about it? What are your opinions on the matter. I'm tempted to just leave it alone and just deal with encroaching rust around the bottom edge as it shows up during annual maintenance. I would never get enough time in the sling to get all of the coats of the other products on the bottom. I'm not a racer and I sail in the ice cold fresh water of Lake Superior, if that factors into your comments.

Thanks!
Todd
1980 C25 SR/FK "Dora"
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psechrist
1st Mate

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USA
29 Posts
Response Posted - 05/07/2010 :  17:24:43  Show Profile
Can't believe no one responded to this. I guess everyone has new boats & we two are the only ones with old boats.
I have the same thing going on. I plan on waiting till the opportunity presents it self then sealing the bottom. When I bought the boat the whole keel was bare so a few inches of bare metal on the bottom isn't going to kill the boat. The keel has been bare on my boat for 33 years.
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John Russell
Master Marine Consultant

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USA
3444 Posts
Response Posted - 05/07/2010 :  20:01:00  Show Profile
Wit all the work you've already done, I think I'd pay for the sling time.
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Stinkpotter
Master Marine Consultant

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Djibouti
9076 Posts
Response Posted - 05/07/2010 :  20:15:33  Show Profile
Leave it! In salt water, you might lose 1/16" of iron from the bottom... In fresh, it's infinitesimal. You have 7/8 ton of cast down there, and there will be 7/8 of a ton when you die. Go sailing and be happy!
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wmuchmore
1st Mate

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USA
56 Posts
Response Posted - 05/17/2010 :  09:33:52  Show Profile
My 1980 cast iron keel has several rusty spots that I have tried to grind off with a disc sander but they are too deep. Is there a chemical treatment that will at least halt the rust progression?
Mike Muchmore
1980 TR/FK
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Stinkpotter
Master Marine Consultant

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Djibouti
9076 Posts
Response Posted - 05/17/2010 :  10:43:42  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by wmuchmore</i>
<br />...Is there a chemical treatment that will at least halt the rust progression?<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote"> Yup--one version is Rustoleum's "Rust Reformer", which apparently is a mild acid in a milky fluid. It turns any ferrous metal (and your fingers) black on contact, stabilizes any rust, and dries essentially clear--meant to be painted over.
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wmuchmore
1st Mate

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USA
56 Posts
Response Posted - 05/17/2010 :  14:25:18  Show Profile
Thanks Dave. Rust Reformer sounds like just what I'm looking for.
Mike Muchmore
1980 TR/FK
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triley
Captain

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USA
251 Posts
Response Posted - 05/18/2010 :  11:59:50  Show Profile
I have sprayed rustoleum blue paint on the leading edge of the keel;same color as petit blue and worked for the season in fresh water. I keep the boat on a lift now and do the same.
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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.