Lead keel coating - SailNet Community
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post #1 of 16 Old 07-31-2006 Thread Starter
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Question Lead keel coating

Having ground my lead keel to a bright rough surface I am about ready to coat it with a two part epoxy tar product prior to applying the antifoul paint. In the past I have tried several systems none of which was 100% successful.
The epoxy tar stuck like crazy in most places but failed in others ( as did the other products/systems). As the epoxy tar is pretty easy to work with this is my preferred option.
Has anyone had similar experience or advice to offer?
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post #2 of 16 Old 07-31-2006
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I guess I am wondering why you want to put an epoxy tar on a lead keel? It does not need to be water proofed. Many racers will put a layer of polyester filler and then sand and fair it.

If you are happy with the surface why not just apply anti fouling??
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post #3 of 16 Old 07-31-2006
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A good solution

Many years ago we had a terrible time keeping bottom paint on our lead keel. We bought the boat used and the patchy texture of the keel paint was a racing no-no. I ground the paint away and went to bright lead before painting. The paint sloughed off in patches. I did this for two years and one day an old gent on the boatyard crew walked over and asked me what I was doing (actually he added some adjectives).

His response saved me a lot of work and money from then on. The gist of what he said is when you brighten the lead, you improve the chances for electrolysis between the lead alloy and the metals in the paint which leads to flaking and peeling.

My keel lead was alloyed with tin and antimony. The bottom paint had copper and tin.

He had three recommendations:
First let the keel oxidize to flat dark grey before painting. The lead oxide coating prevents the electrolysis. Second, use a paint without tin. Third if I was in a hurry use epoxy tar on the lead.

Since I had brightened the lead and I was in a hurry (it was mid season) I used the epoxy tar. In the remaining 15 years I never had to give the keel extra attention again.
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post #4 of 16 Old 07-31-2006 Thread Starter
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Thanks for the replies:
Gary: The reason for the epoxy tar is because when I used bottom paint ( with an 'etch' primer') on the lead it flaked off, big time.
The epoxy tar seems to stick to the lead better and is compatable with bottom paint (i.e. it sticks to it).
DynaMeme: I gather then going straight onto the bright lead with epoxy tar worked for you??
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post #5 of 16 Old 07-31-2006
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Quote:
Originally Posted by Gary M
If you are happy with the surface why not just apply anti fouling??
An unencapsulated lead keel will rust like crazy with rust booms erupting through the paint in a short time. Anything that can be done to retard this process will extend the paint's lifespan.
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post #6 of 16 Old 07-31-2006
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Lead rust?

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Originally Posted by Fstbttms
An unencapsulated lead keel will rust like crazy with rust booms erupting through the paint in a short time. Anything that can be done to retard this process will extend the paint's lifespan.
It may oxidize, but it sure ain't gonna rust!
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post #7 of 16 Old 07-31-2006
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Quote:
Originally Posted by Soutie
Thanks for the replies:
Gary: The reason for the epoxy tar is because when I used bottom paint ( with an 'etch' primer') on the lead it flaked off, big time.
The epoxy tar seems to stick to the lead better and is compatable with bottom paint (i.e. it sticks to it).
DynaMeme: I gather then going straight onto the bright lead with epoxy tar worked for you??

Yep, we just wiped the keel with MEK and were careful not to lean against it or touch it aftew we did to avoid recontaminating the surface with body oils, sweat, and boat yard grime.
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post #8 of 16 Old 07-31-2006
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"An unencapsulated lead keel will rust like crazy"
OK, Pull it over and surrender the bottle!

And if there's no bottle, please report to sick bay, you've got heat stroke. (No fun sailing THIS week!)
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post #9 of 16 Old 08-01-2006 Thread Starter
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To all thanks for the input both valuable and humourous
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post #10 of 16 Old 08-01-2006
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Wipe it with Acetone.

Coat it with Interprotect 2000e 4 - 5 coats.

In warm conditions you can do a coat every 3 hours.

In cooler every 6 hours.

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