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Old 12-30-2012
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Caulking bottom of new rope clutches

So Santa came through with a pair of double rope clutches. Lewmar failed to include any installation instructions. I've read that Life Caulk may not be compatible with plastic. Long story short - what would you use to make these watertight?

Thanks!
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Old 12-30-2012
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Re: Caulking bottom of new rope clutches

I used butyl tape with my Lewmar clutches.
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Old 12-30-2012
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Re: Caulking bottom of new rope clutches

Ditto on the butyl. Make sure you countersink the bolt holes to avoid stress cracks in the gel coat, and use backplate, or at least fender washers. Great Christmas gift, how did he know!?!?!?!?
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Old 12-30-2012
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Re: Caulking bottom of new rope clutches

Once you've worked with butyl tape, you won't want to go back to messy liquid sealants.

Life Caulk is the devils-own invention, very runny, hard to remove - I can say that because I used it to seal my rope clutches!

I make my own backing plates with s/s plate from McMaster Carr. Finished job looks like this (4-way Garhauer rope clutch)



S/S has a reputation for being hard to work, but I did this all with ordinary tools - jigsaw with HSS blade, files, sandpaper, power drill with carbide bit.
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Last edited by MarkSF; 12-30-2012 at 11:09 PM.
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Old 02-20-2014
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Re: Caulking bottom of new rope clutches

Quote:
Originally Posted by MarkSF View Post
Once you've worked with butyl tape, you won't want to go back to messy liquid sealants.

Life Caulk is the devils-own invention, very runny, hard to remove - I can say that because I used it to seal my rope clutches!

I make my own backing plates with s/s plate from McMaster Carr. Finished job looks like this (4-way Garhauer rope clutch)



S/S has a reputation for being hard to work, but I did this all with ordinary tools - jigsaw with HSS blade, files, sandpaper, power drill with carbide bit.
Pardon for resurrecting an old post, but do you remember what thickness SS plate you ordered from McMaster Carr? I'm getting ready to install a 3-way rope clutch and deck organizer on my boat and am very impressed with the look of your install in the cabin!
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Old 02-20-2014
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Re: Caulking bottom of new rope clutches

That is not my post but I will chime in... First how big is the boat ie. large boat bigger loads what is the deck cored with in the area you are installing the hardware? I have a Coronado 25 a small vessel so I backed my hardware with .25" Lexan w/ washers. I know the Lexan will flex a bit bot I am not concerned as the loads are light. If I were going to do it with stainless I would use 316 alloy .125" thick. I used SS .1875" thick on my Catalina 30.
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Old 02-20-2014
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Re: Caulking bottom of new rope clutches

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Originally Posted by itsaboat View Post
Pardon for resurrecting an old post, but do you remember what thickness SS plate you ordered from McMaster Carr? I'm getting ready to install a 3-way rope clutch and deck organizer on my boat and am very impressed with the look of your install in the cabin!
Actually I found similar plate at Metals Depot and it's quite a bit cheaper. I just bought 14 gauge 304 s/s plate, 0.075" thick. $16 for a 1' square sheet. Same cost again for shipping.
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Old 02-21-2014
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Re: Caulking bottom of new rope clutches

Once again, I'm the odd man out, but I would use the one product specifically designed to bed hardware on a boat; bedding compound. Often found under the trade name Dolphinite, but there are a few others still on the market. It's cheap, easy to use and easy to clean up, with turps.
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Old 02-21-2014
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Re: Caulking bottom of new rope clutches

There are numerus options other than SS. SS looks nice, but so can other options when painted, making them less visually obvious than SS.

Aluminum. Broadly available, light, easy to work. Won't corrode unless you are leaking seawater, which you shouldn't be.

FRP. Very effective when bonded to the hull. No corrrosion.

---

Dolfinite? Polyurethane? Bulyl? It depends on the application. Polyurethanes are quite adhesive and removale can be trouble. Butyl allows easy removle, is VERY waterproof, but relys on a good mechanical mounting. Donfinite is middle ground. I use all of them, but I think I would go for butyl in this case because...

* a good mechanical mount will be provided.
* flexing is posible.
* removal is possible.

I'll generally go will polyurethane for screw-mounted hardware, where a little extra bond helps.
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Re: Caulking bottom of new rope clutches

Yes my main reason for using the stainless was that Bristol had used it already, on the visible backing plates, for uniformity of appearance.

Inside lockers (mainly stantions) they used FRP.
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