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 What kind of goop?		  New Topic  Topic Locked
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britinusa
Web Editor

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USA
5404 Posts
Initially Posted - 12/27/2008 :  15:01:54  Show Profile  Visit britinusa's Homepage
My outboard electric supply wire is fed through a hole that was cut into the transom within the 'ding' on the stbd side round-down.

The hole was 'waterproofed' (ha!) with some kind of goop which has got messy in the past 3.5 years and is certainly not keeping the hole dry any more (it's above the water line by about 13")

Any idea what kind of 'goop' would have been used? some kind of mastic/caulk/goop?

I know that someone of this site used plumbing fixture to go thru the transom, but not sure that I could get that done before our trip on new years day.

I just opened the area up (removed the goop) to feed my TV Antenna Cable through the hole so now 3 'wires' are going through that hole, outboard power, solar power and TV antenna

Paul
Joint Decision. (Sold)
PO C250WB 2005 Sail # 841.


Moved up to C34 Eximius

Updated August 2015
Edited by - britinusa on 12/27/2008 15:03:39

delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 12/27/2008 :  15:30:03  Show Profile  Visit delliottg's Homepage
Paul,
You might look into a [url="http://www.westmarine.com/webapp/wcs/stores/servlet/producte/10001/-1/10001/46515/377%20710/0/cable%20clam/Primary%20Search/mode%20matchallpartial/0/0?N=377%20710&Ne=0&Ntt=cable%20clam&Ntk=Primary%20Search&Ntx=mode%20matchallpartial&Nao=0&Ns=0&keyword=cable%20clam&isLTokenURL=true&storeNum=5003&subdeptNum=3&classNum=30"]cable clam connector[/url] that would accommodate all three cables at once as well as providing a mechanical waterproof connection. I used a large one to run my charging cables from our new Tohatsu.

To install it, you need to first freeze the rubber puck to make it easier to drill. Drill slightly undersized (only slightly), using water as a lubricant if necessary. I made a little jig to allow drilling the figure eight necessary to fit the cable to the Tohatu and used an Xacto knife to trim out between the holes. I used a bit of caulk to seal the drill holes. I have used these for three different hull penetrations with no leaks yet.
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Voyager
Master Marine Consultant

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USA
5267 Posts
Response Posted - 12/28/2008 :  21:31:12  Show Profile
Not all goops are created equal (-ly).

I might suggest polysulfide caulk to keep water out. The nice thing about polysulfide is that it sticks reasonably well to fiberglass, metal, wood, plastic, etc, so it creates a water-tight seal, unlike silicone that must be mechanically compressed to maintain a seal.

But, it is not a permanent adhesive like polyurethane caulk, which can be quite difficult to remove in the future.

Polysulfide remains flexible for years and can be completely removed with only a bit of elbow grease.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
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