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Discussion Starter · #1 · (Edited)
Mr. cthoops and I had a great season last year - our first as boat owners.

We were down at the boat today greasing and lapping the sea cocks when Mr. Cthoops noticed that we have some water penetration at the port chainplate. It wasn't evident last year, and I suspect the heavy snow we've had this winter was the final straw. The prior owner (who owned the boat for over 15 years) said he had pulled them a few times and always wondered why he bothered because it had been dry, so I don't think this is a situation where they were neglected for the past 20 years.

It looks like rebedding the chainplates is going to be our first "real" maintenance project on the boat. We have Don Casey's "This Old Boat" and we are also scouring the internet for info, but I was looking for any tips others might have. Is this something that can be done in a day? Can we use butyl (thereby not having to wait until late March or April for warmer temps) or do we need to use epoxy or 3M. The instructions for 3M say not to apply in temps under 40 degrees. If it's in the mid-40's but drops down to freezing at night, will it just take longer to cure, or do we need to wait until temps stay above 40 day and night?

Attached is the picture of the area that showed us something was up.

If you can't tell yet, any suggestions or advice would be most welcome.

Thanks!
 

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Corsair 24
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are the plates behind that box?

many ways to bed plates..

I used sikaflex, butyl is good, stretchy sealants...whatever

it does depend a bit on hoy they are installed but Im a fan of only sealing from the top...never from under...that way if you do spring a leak you can trace it better

all I see in your pic is some damp wood at the bottom of that box joint

cheers
 

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Only sealing the top is correct - for all deck fittings. If you seal top & bottom a top leak will go into the core or elsewhere into the boat.

You should remove the chains to check them for crevice corrosion where they pass through the deck.

When you have the chains out, take the opportunity to seal any exposed core with epoxy. Then chamfer or countersink the top of the hole they go in to create an "O-ring" for the sealant to squeeze into.
 

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I just finished digging out all the caulk and sealant (including silicone) from the previous owner's decades of stuff and go.

Butyl tape from MaineSail's web site is the way to go, and just from the top as the idea is to keep water out, not seal it in.
 

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Will any butyl tape work or is there a marine version that should be used. Sorry for the question, but I do not want to pick up the tape from Home Depot only to find out it failed because I have the wrong kind.
 

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Will any butyl tape work or is there a marine version that should be used. Sorry for the question, but I do not want to pick up the tape from Home Depot only to find out it failed because I have the wrong kind.
Well any will work for a while, but most "home depot" or "RV" parts places does not seem to last long. Since this is not a job you want to do often then I think it makes a lot of sense to do it once and do it right. Maine Sail's stuff is known to be a good and not that much more than the cheap stuff. So it does not really makes sense to use anything else. Plus you help support one of the best do it yourself and objective testing sites out there. (it is not like he is going to retire off of the stuff though)
 

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A good idea is to also pot the holes with thickened epoxy so any leakage comes into the cabin and not the deck core. I rebedded mine a few years ago and potted the holes and used butyl from MaineSail. No leaks.

Chainplate Rebedding - TKRonaBoat

Is that all you used? Seems like not much sealant at all.
 

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Is that all you used? Seems like not much sealant at all.
It's all in the link I provided to my project.

That amount of butyl would have been fine for sealing the penetration. I also wanted to seal the bottom of the plate to the deck so water and dirt do not get under it.
 

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Discussion Starter · #13 ·
Thank you for all of the suggestions. We went back to the boat yesterday and removed the wood covering the chainplates. Things look pretty good overall, so when Maine Sail's butyl arrives this week we'll head back down this weekend (weather permitting), pull and inspect the chainplates, and hopefully finish everything up.
 

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I just ordered 2 rolls from MaineSail yesterday. I will be doing the same project next week after this weather system passes and will also be re-bedding everything attached to my deck. The PO used a lot of silicone on this boat.
 
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