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  #291  
Old 11-03-2013
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Re: Bedding Deck Hardware With Butyl Tape

Is the transom cored?
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  #292  
Old 11-14-2013
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Re: Bedding Deck Hardware With Butyl Tape

For replacing external chainplates attached to the side of the hull, the manufacturer recommends 3M4000 for UV protection. I was thinking that butyl tape would be better. Thoughts? Mosaic, Friday Harbor, WA
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  #293  
Old 11-14-2013
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Re: Bedding Deck Hardware With Butyl Tape

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Originally Posted by Mosaic View Post
For replacing external chainplates attached to the side of the hull, the manufacturer recommends 3M4000 for UV protection. I was thinking that butyl tape would be better. Thoughts? Mosaic, Friday Harbor, WA
If the plates are bolted externally what are you sealing from? Just the bolt holes? I don't see the UV exposure. If so then I would put butyl under the chain plates around the holes and under the head of the bolts.

As far as Butyl and UV I'd like an answer too. I bedded my chainplates in butyl last season (through the deck) but was hesitant about letting butyl be exposed to UV dirt etc, so I put a layer of lifecaulk over that. I'm not sure this was smart because the lifecaulk has turned yellow.
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  #294  
Old 12-04-2013
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Re: Bedding Deck Hardware With Butyl Tape

This is a very informative and extensive discussion. After reading the instructions and comments over the past fiew months I am ready to do some work on my boat this winter/spring. I am curious if anyone compared the efficacy of the butyl tape with that of 3M 4200 or other marine materials using the exact techniques for rebedding described in this post. After countersinking the holes, cleaning the surfaces, tightening the nuts without bolt rotation, since it seems the whole process is so technique dependant, shouldn't both products work equally well? A concern of mine is that since butyl tape continue to be so pliable it will continue to flow when exposed to heat during the summer and the additional tightenings may result in accidental rotation of the bolt. Has anyone considered using spacers under deck hardware to facilitate a more even distribution of the material and prevent overtightening?
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Old 12-04-2013
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Re: Bedding Deck Hardware With Butyl Tape

Butyl has more stretch.
When a deck fitting moves, (and they all will eventually) the butyl maintains the seal where the 3M products have dried up, and allow the seal to be broken.
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Old 12-04-2013
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Re: Bedding Deck Hardware With Butyl Tape

Spacers are not necessary. The butyl will stop flowing after a short while. Ultimately the hardware item will be very close to the deck and that is the reason that the fastener holes are chamfered (countersunk). This gives an "O" ring of sealant around the fastener. For a given amount of movement the thicker the sealant the more movement is allowed before the seal breaks. When the hardware moves under strain, and it will slightly, the sealant used must allow enough stretch without the seal being broken. Butyl excels at this, more so than any other sealant, which will harden over time and lose its elasticity. My CS27, like Maine's CS36T, was built with butyl under all deck hardware and there are no issues 30+ years later - including the hull/deck joint.
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Re: Bedding Deck Hardware With Butyl Tape

Thanks for the clarification, I guess I will be ordering butyl tape soon. Would you also use this product between wood and fiberglass deck or winches and wood?
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Re: Bedding Deck Hardware With Butyl Tape

I would use it anywhere above the waterline where the item is bolted in place. I don't think an item attached with screws can always compress it enough. It can be dissolved by fuel as well.

If attaching wood or to wood I would make sure the wood is sealed and not bare. Varnish, paint, or ideally the wood is epoxy sealed first, as it probably should be anyway for longevity.
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Old 12-05-2013
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Re: Bedding Deck Hardware With Butyl Tape

What about bedding deck hardware to an old teak deck? Still use butyl? What would you seal the teak with?
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Re: Bedding Deck Hardware With Butyl Tape

You could seal the deck with Cetol or any of a number of varnishes out there.
Yes, I would seal deck hardware to a wood deck with it.

I do NOT think I would use it for below-the-waterline applications. There are some things that the 3M products are still good for.
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