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Go Back   SailNet Community > On Board > Gear & Maintenance
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  #1  
Old 07-19-2007
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keel - rust

All,

Just hauled my boat out and found quite a bit of rust on the keel.

Any advice on what to do about that?

Attempted to attach photo but failed, anyway there is a link below;


Last edited by jorgenl; 07-19-2007 at 05:09 PM.
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Old 07-19-2007
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that does not look real bad I would guess that you will be doing bottom paint if so I would just hit it real good with a wire wheel an a grinder so all the rust is gone than follow the instructions on wharever bottom pant you choose.

good luck It could be a lot worse it could have been all the keel bolts so bad that you did not have a keel to rust.
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Old 07-19-2007
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Cast iron keels are prone to this sort of thing. Best way to deal with this condition is to epoxy-seal the whole thing. This involves sandblasting or otherwise removing all the paint (down to bare metal) and quickly sealing with a sealing epoxy. (S3, IIRC)

Properly done, this will prevent rust from appearing for several seasons at least, unless the coating is broken from contact with debris or the bottom.

If you choose to remove the paint yourself, be sure to use proper respiratory & body protection and collect and dispose of the debris as required by your local laws/yard rules.
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Old 07-20-2007
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Gents,

Thanks for your advice.

Grinding the rust did not work to well so I foillowed the second advice (before I got it) and had the keel sandblasted. It will be epoxy painted by the yard (a couple of coats) and the bottom paint will be applied to keel and hull.

Thanks again.
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Old 07-20-2007
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Epoxy paint?

Quote:
Originally Posted by jorgenl View Post
Gents,

Thanks for your advice.

Grinding the rust did not work to well so I foillowed the second advice (before I got it) and had the keel sandblasted. It will be epoxy painted by the yard (a couple of coats) and the bottom paint will be applied to keel and hull.

Thanks again.
I'm not sure about epoxy paint as a permanent barrier. Once the keel is cleaned to bare metal, you have the opportunity to cover it with a finish that will last for many years, except for dings you may need to repair. I've done this on a Rhodes 19 and a Beneteau I owned by laying on five coats of West Systems epoxy and this cover held up beautifully.

Is this epoxy paint actually bottom paint with an epoxy binder? If so I don't think it'll provide the strength and permanence you need - it sounds like something that is easy for the yard to apply...laying on five coats of epoxy is time-consuming, but what you need for a long-lasting cover.

I'd press the yard about the longetivity you'll get from "paint", it may be fine, but I certainly would be leery of it.

You don't want to have to do this again in three years.
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They mentioned that they would use a product called "Interprotect" - I think.
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SanderO is an unknown quantity at this point
Sand Blast to till the metal is shiny
Immediately coat with epoxy tar coating
Apply epoxy barrier coating, then fairing
bottom paint
Do not sand through epoxy exposing metal EVER
You're good to go for years. I've been good for 15+ so far.

jef
sv shiva
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Old 07-20-2007
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Interprotect is a barrier coating and can be used as a primer for metals, like his keel, in boats. It should be fine. Personally, I'd prefer some layers of epoxy and glass over the keel, but that is probably overkill for the situation.
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Interprotect

Quote:
Originally Posted by jorgenl View Post
They mentioned that they would use a product called "Interprotect" - I think.
I used interprotect when i refinished our current boat's bottom, after using a recommended primer I did apply it to our lead keel., and its held up fine.

I do not think Interprotect is hard enough to provide the protection that a steel keel needs - you can gouge an Interprotect finish with a key - I myself would again do 5 coats of West Systems epoxy. I guess if the yard manager says they've done many steel keels with Interprotect and five years later they're still pristine and he KNOWS that, then you can chose to trust his experience - if he doesn't have that specific experience, I'd use hard epoxy not the bottom coat stuff.
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Agreed

I'd second SF's point - you'd be better off with a more substantial epoxy coating, backed up with Interprotect afterwards.
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