I'd use 3M 4200. Waterproof, adheres well and, if you apply it carefully, 
should look ok. 

Rich Knowles
Indigo. LF38
Halifax

On 2012-09-22, at 22:57, cenel...@aol.com wrote:

I am In the process of replacing my instrument set which is housed in a NavPod 
1x4 above the companionway mounted to a stainless steel
U-shaped pipe bolted to a cross member of the hatch cover assembly.

With some work, I managed to cut a 7/8" hole in this pipe and another in the 
binnacle guard for the Garmin chart-plotter NMEA 2000 network cable.

In order to get the cable from the NavPod below deck, I had previously cut a ~ 
5/8" - 3/4" hole beneath the hatch cover assembly. I lined this with a short 
portion of a plastic hose jammed in and initially above the surface of the deck 
thru which it penetrates. Of course over time its extension above the surface, 
which prevented water from getting into this hole, was broken off so that now 
in any kind of rain, I get lots of water pouring thru this hole.

The single cable which now must go thru this hole is ~ 1/4 to 3/8" and will fit 
but my question is the following:

What is the easiest, semi-permanent solution to seal the hole with the cable in 
it. I could mix up an epoxy/filler and seal it relatively permanently but as 
this is my 3rd set of instruments, I don't think a permanent solution is the 
answer. I could use some butyl tape jammed around the cable or maybe some messy 
silicon caulk.

I haven't come up with anything else, short of repeating my previous method 
with a hose stand-off above the surface to prevent rainwater from entering.

I am sure the list members have likely faced similar problems and come-up with 
alternate solutions.

Suggestions welcome.

Thanks,

Charlie Nelson
Water Phantom
C&C 36 XL/kcb
Greenville,NC





cenel...@aol.com
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