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Old 18-12-2010, 10:38   #1
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What's the Best Way to Protect Keel Bolts ?

With the rainy season I've noticed some water in the bilge and a little rust forming on the bolts. Obviously this is not good. I've cleaned off the rust but what should I do to keep this from happening again. I'm thinking about melting some wax and coating them.

Is there a better solution?
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Old 18-12-2010, 10:48   #2
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I bet fluid film would be good.
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Old 18-12-2010, 10:58   #3
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The previous owner has sprayed Waxylon a car body underseal on our some years ago. Whilst it doesn't look very attractive its working well. Moodys used a gelcoat flowcoat originally.

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Old 18-12-2010, 11:02   #4
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Try Lanocote...
Not my favorite anti-sieze but should be quite useful for what you are talking about.
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Old 18-12-2010, 13:37   #5
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Ohetr tahn da sky wrehe's all taht wtear cnomig form? Es et nroaml taht atfer a rian ta hvae ae hlaf icnh a wtaer en da bgidle? Da msat be setpped on da dcek, mbaye sulhod I sael da santtoins? I cehkced da ckocs an hsoe calpms, tehy aapepr a be fnie. Colud stetnig en da btotom csuae porebms?

I dno't lkie wtaer dwon tehre..
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Old 18-12-2010, 13:51   #6
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Ohetr tahn da sky wrehe's all taht wtear cnomig form? Es et nroaml taht atfer a rian ta hvae ae hlaf icnh a wtaer en da bgidle? Da msat be setpped on da dcek, mbaye sulhod I sael da santtoins? I cehkced da ckocs an hsoe calpms, tehy aapepr a be fnie. Colud stetnig en da btotom csuae porebms?

I dno't lkie wtaer dwon tehre..
Yeah, it's best to keep'm dry if they are a ferrous metal. Check out you deck fittings and hull to deck joint.
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Old 18-12-2010, 14:16   #7
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Originally Posted by Larsdelmar View Post
With the rainy season I've noticed some water in the bilge and a little rust forming on the bolts. Obviously this is not good. I've cleaned off the rust but what should I do to keep this from happening again. I'm thinking about melting some wax and coating them.

Is there a better solution?
petroleum jelly
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Old 18-12-2010, 15:32   #8
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I am not gonna touch that line!!!!!!!!!!!!!!!!!!!!
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Old 18-12-2010, 16:57   #9
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Assuming they are stainless bolts, the WORST thing you can do is seal them. If SS is deprived of oxygen in water, it will quickly crevice corrode, even in a humid environment, and since no seal is both permanent and totally effective at eliminating all water, sealing usually leads to worse problems than it solves regardless of what you try. It is "stainless", not "rustproof".
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Old 20-12-2010, 07:42   #10
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Assuming they are stainless bolts, the WORST thing you can do is seal them. If SS is deprived of oxygen in water, it will quickly crevice corrode, even in a humid environment, and since no seal is both permanent and totally effective at eliminating all water, sealing usually leads to worse problems than it solves regardless of what you try. It is "stainless", not "rustproof".
In my opinion you are making very gross generalizations. Crevice corrosion is caused by acids in water breaking down the passivated protective oxide layer on the surface of the metal when the metal is in an oxygen-poor condition. Sea water is more prone to attacking that oxide layer because of the clorides in seawater, fresh water far less; however acid rain can cause the same effect as seawater. That said, there are many alloys of "stainless steel" some far more suited for underwater use than others. Also, the shape and machining and surface smoothness of the metal will influence its ability to deny crevice corrosion. Finally for you to say stainless steel will "quickly crevice corrode" is simply not accurate and very misleading.

To the OP's original question, I would use Lanocote as well.
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Old 20-12-2010, 17:11   #11
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Thanks everyone, it just goes to show there's always more than one way to skin a cat. Being new to boat maintenance it's nice getting different ideas. I'm sure I'll have many more questions as I begin to go through and learn the systems on board.
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Old 20-12-2010, 17:51   #12
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In my opinion you are making very gross generalizations. Crevice corrosion is caused by acids in water breaking down the passivated protective oxide layer on the surface of the metal when the metal is in an oxygen-poor condition. Sea water is more prone to attacking that oxide layer because of the clorides in seawater, fresh water far less; however acid rain can cause the same effect as seawater. That said, there are many alloys of "stainless steel" some far more suited for underwater use than others. Also, the shape and machining and surface smoothness of the metal will influence its ability to deny crevice corrosion. Finally for you to say stainless steel will "quickly crevice corrode" is simply not accurate and very misleading.

To the OP's original question, I would use Lanocote as well.
It is the oxygen which renews the oxide layer protecting the steel; without it, you lose all protection. This isn't a generalization; it is a fact as is the fact the steel will corrode in the absence of air. These are fundamental
truths learned both theoretically and by experience as a chemical engineer for over 30 years.
Your boat, your rules but please don't imply I am misleading anyone.
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Old 24-12-2010, 12:56   #13
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Lars-
Assuming you want to seal them, you can place a paper cup around each one, with the bottom cut out. Then pour in beeswax to surround and seal.

Beeswax is cheap, easily removed for inspections, won't make a mess or migrate. In the US, typically $3 buys a good amount as a "toilet bowl gasket", the big donut-shaped wax ring used to seal under toilet bowls. Much cheaper than the higher grades used in candle-making and such.
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Old 24-12-2010, 13:39   #14
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Quote:
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Ohetr tahn da sky wrehe's all taht wtear cnomig form? Es et nroaml taht atfer a rian ta hvae ae hlaf icnh a wtaer en da bgidle? Da msat be setpped on da dcek, mbaye sulhod I sael da santtoins? I cehkced da ckocs an hsoe calpms, tehy aapepr a be fnie. Colud stetnig en da btotom csuae porebms?

I dno't lkie wtaer dwon tehre..
Can you say that again after the Schnapps has worn off please.....
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Old 22-10-2013, 11:27   #15
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Re: What's the Best Way to Protect Keel Bolts ?

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Lars-
Assuming you want to seal them, you can place a paper cup around each one, with the bottom cut out. Then pour in beeswax to surround and seal.

Beeswax is cheap, easily removed for inspections, won't make a mess or migrate. In the US, typically $3 buys a good amount as a "toilet bowl gasket", the big donut-shaped wax ring used to seal under toilet bowls. Much cheaper than the higher grades used in candle-making and such.
That is a neat idea I can see many ways this could be modified to use any number of inert (relatively) materials englobing the bolts to protect them. I'll definately look into this whenit's my turn.
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