Best of the bad choices- re-bedding chainplate cover - SailNet Community
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post #1 of 9 Old 06-13-2012 Thread Starter
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Best of the bad choices- re-bedding chainplate cover

I don't live anywhere near a store that carries life seal or 3m 4200, my choices are Marine Amazing goop, 3m 5200, or a hardware store silicone. What would be best.
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post #2 of 9 Old 06-13-2012
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Re: Best of the bad choices- re-bedding chainplate cover

point and click to Defender and order a couple of tubes of 4200.
3M Marine Adhesive / Sealant Fast Cure 4200
You've waited this long to do the job, you can wait a couple more days for the right stuff to arrive in the mail.
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Re: Best of the bad choices- re-bedding chainplate cover

Or mainesail's Butyl tape. :-)
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Re: Best of the bad choices- re-bedding chainplate cover

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point and click to Defender and order a couple of tubes of 4200.
3M Marine Adhesive / Sealant Fast Cure 4200
You've waited this long to do the job, you can wait a couple more days for the right stuff to arrive in the mail.
Of that lot the best is 5200. The problem will be one day in the future when you need to replace those covers. They will be effectively welded to the deck! 4200 is more suitable for anything that might one day be removed.

Bristol 31.1, San Francisco Bay
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Re: Best of the bad choices- re-bedding chainplate cover

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point and click to Defender and order a couple of tubes of 4200.
3M Marine Adhesive / Sealant Fast Cure 4200
You've waited this long to do the job, you can wait a couple more days for the right stuff to arrive in the mail.
Even 4200 can be more agressive than necessary. Like many applications adhesion isn't a requirement for chainplates (the sealant isn't holding in the chainplates!) but flexibility is. I think polysulfide or butyl tape is idea for chainplates. Don't go near the 5200 or you, or some poor future owner will be cursing you.

Read this. This is written by SailingDog
Adrift at Sea Marine Sealants in a Nutshell

But yes I agree it's worth putting in an order to get the right stuff. Don't just settle for what's in the hardware store.
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Re: Best of the bad choices- re-bedding chainplate cover

I'm not a big fan of butyl for chainplate covers because of the ooze-out factor. for clearts toerails, lights, great, but for exposed, unflanged horizontal surfaces, i like something that sets and cures, like 4200.

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post #7 of 9 Old 06-15-2012
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Sika261 never hardens like 5200 or 4200 (adhesives) and remains flexible.
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post #8 of 9 Old 06-15-2012
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Re: Best of the bad choices- re-bedding chainplate cover

I guess you are not near a Home Depot, Lowes or Walmart? All three carry 4200 here.

You are not talking about a major structural seal, stay away from 5200 as said above. If you go with silicone just make sure it is silicone ADHESIVE, not just regular silicone. Not just for the adhesive properties, I've just found it to last much longer. You'd be surprised how strong it is, I use it all the time in a pinch and bet it is just about as strong as 4200. Marine goop is probably a silicone adhesive but check the package. I use any "outdoor, waterproof" silicone adhesive, even below the waterline....never had it fail.

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Last edited by HarborRat; 06-15-2012 at 12:29 AM.
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Re: Best of the bad choices- re-bedding chainplate cover

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Originally Posted by asdf38 View Post
Even 4200 can be more agressive than necessary. Like many applications adhesion isn't a requirement for chainplates (the sealant isn't holding in the chainplates!) but flexibility is. I think polysulfide or butyl tape is idea for chainplates. Don't go near the 5200 or you, or some poor future owner will be cursing you.

Read this. This is written by SailingDog
Adrift at Sea Marine Sealants in a Nutshell

But yes I agree it's worth putting in an order to get the right stuff. Don't just settle for what's in the hardware store.
Some degree of adhesion is necessary, otherwise water will be drawn in between the sealant and the deck by capillary action. That's why all the sealants recommended by manufacturers for chainplates and other deck hardware (LifeCaulk, LifeSeal, 3M 4200 and so on) are at least medium adhesion.

Bristol 31.1, San Francisco Bay
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