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 Catalina 25 Specific Forum
 Rusted keel bolts		  New Topic  Topic Locked
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James Simmons
1st Mate

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USA
41 Posts
Initially Posted - 04/02/2009 :  22:22:55  Show Profile
I have a 1982 fixed keel C-25 with rusted keel bolts. They still look structurally sound and I plan on wire brushing them and then applying some sort of coating or grease for future protection. I would appreciate any input as to what I should use for this. I did a search in the archives and didn't come up with anything.
Thanks!
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Sloop Smitten
Master Marine Consultant

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USA
1181 Posts
Response Posted - 04/02/2009 :  23:01:21  Show Profile
James,
Do a google search on rust coatings and you will find numerous coatings that will convert rust to a protective-hardened coating. If they are rusty you obviously have the zinc or steel bolts they used before they converted to stainless steel. You will "never" get them out so coating them is your best choice. If they are to bad you can drill and tap new bolts and essentially sister the original bolts. Search JimB's early postings and he has a great write-up for when he purchased his boat and had this done. He also describes the coating they used on his original bolts when they added his new bolts.
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JimB517
Past Commodore

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USA
3285 Posts
Response Posted - 04/02/2009 :  23:16:59  Show Profile  Visit JimB517's Homepage
the treatment is oxalyic acid (spelling) and the coating is bitumen.
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James Simmons
1st Mate

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USA
41 Posts
Response Posted - 04/03/2009 :  13:15:28  Show Profile
I was thinking of a bitumen based material. The oxalic acid should do a good job of cleaning up the rust as well.

I am also considering doing a good hand tool clean (wire brush), with a solvent wipe and then spraying on RustOleum Rust converter in a couple of coats. After that applying (1)a coat or two of leftover epoxy paint I have, (2) a bitumastic roofing caulk, or, (3) heavy duty grease. The easiest is the grease and I figure I need to inspect the bilge at lease annually and could easily re-apply it at that time if needed. The epoxy would last the longest and need the least maintenance, of course.

Decisions! Decisions!

Thanks for your input!
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GaryB
Master Marine Consultant

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USA
4304 Posts
Response Posted - 04/03/2009 :  23:16:47  Show Profile
Be careful using a wire brush. Unless you use stainless steel you will leave tiny bits of metal from the wires that will rust overnight. You will only make the problem worse. You might do better using some type of 3M synthetic pad.

Let me know what you decide to do and how it goes as I have the same problem. Mine is just light surface rust and shouldn't be too hard to remove.
Edited by - GaryB on 04/03/2009 23:18:06
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txbigfoot
Navigator

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USA
194 Posts
Response Posted - 04/03/2009 :  23:47:58  Show Profile
I had rusted keel boats and had to buy the kit from catalina direct. i still have 3 feet of the all thread and the drill bit if you are interested in sistering some new bolts on. This kit is only good for the cast iron keel and not the lead keel.

Dan
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Sloop Smitten
Master Marine Consultant

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USA
1181 Posts
Response Posted - 04/03/2009 :  23:52:02  Show Profile
Dan,
Curious what you think of the CD kit. How did you drill the holes? Hand drill?
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James Simmons
1st Mate

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USA
41 Posts
Response Posted - 04/04/2009 :  06:30:41  Show Profile
I decided to go with the epoxy coating. I wire brushed the bolts first then used synthetic steel wool to finish up most of the rust removal. I then applied RustOleum rust converter (comes in a spray can). My next step will be to brush a couple of coats of epoxy, overlapping the bolts and the fiberglass to seal everything off.
Hopefully I will be good to go for some time!
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txbigfoot
Navigator

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USA
194 Posts
Response Posted - 04/04/2009 :  09:31:03  Show Profile
I used a small starter bit on a hand drill. Then we used the larger drill bit. it was tedious but very do able. You had to drill through the thick hull so you need to have much longer its than you expect.
Dan
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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.