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Epoxy primer on joint between iron and led keel

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AndreasN View Drop Down
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    Posted: 22 May 2020 at 22:03
I am doing some work on my keel. I removed the sikaflex that have been used to fair the joint between upper (iron) and lower (led) part of the keel. There where no primer behind the sikaflex.

I am going to put some coats of epoxy primer on the rusty parts I fixed. Is it okay to put epoxy primer on the joint as well, and then apply the sikaflex?

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H8jer View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote H8jer Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2020 at 15:43
As it 2 separate parts I would apply 300my (5 layers brush / 7-8 layers roller) epoxy on both parts. This might or might not cover the gap.
Either way I would apply sika or tec7 ontop of the primer in the remaining gap.

Then wait until the tec7 is not tacky anymore and the apply antifouling

/h8jer
Hanse 370#487 30HP 3-cabin
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AndreasN View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AndreasN Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2020 at 18:16
Originally posted by H8jer H8jer wrote:

As it 2 separate parts I would apply 300my (5 layers brush / 7-8 layers roller) epoxy on both parts. This might or might not cover the gap.
Either way I would apply sika or tec7 ontop of the primer in the remaining gap.

Then wait until the tec7 is not tacky anymore and the apply antifouling

/h8jer

Thank you so much for answering. I also have some epoxy fairing I could use. But I assume there is a good reason they have used sikaflex in the joint?
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H8jer View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote H8jer Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2020 at 18:43
In my case I have a perfect wife that can clean up and beautify when I did apply tec7 between the keel and hull. From your picture it looks like that you also could do this? New primer and new sealant is better than old...

Epoxy primer/faring is rigid and can not flex. The keel will flex minimal and also the iron/lead join will flex. Iron and lead also has different temperature extending.
This WILL crack the epoxy and a microscopic gap will occur. The Sika/tec7 will prevent this.
It is the same in a bathroom with ceramic tiles where the corners are treated differently
Hanse 370#487 30HP 3-cabin
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