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Old 08-19-2009, 02:19 AM   #1
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What's the name of the "gooey" sealant used on cable pass throughs?

I'm in the process of running a new 50' HDMI cable from my entertainment center to the rear bedroom TV. I think I have the route all figured out and have been able to get it fished from the TV down into a basement storage bay via the water heater cabinet. In order to get into the slide containing the entertainment system, I need to drill a pass through hole in the side of the basement storage bay.

Is my best bet to just find a suitable gromet at Home Depot and then seal it on both sides with that gooey looking sealant? What is the name of the sealant? Are there specialized gromets anywhere which would make this an easier/better job?

All input is appreciated. Once the cable is run, I'll be adding a second coax cable from the roof to get full DVR functionality. Winnie ran two wires from the sat dish through the roof but terminated one of them at that point. I'm pretty sure I'll be able to run a cable from there, down through the trim, then behind the dash and through the firewall before heading back to come back inside under the entertainment center. Now all I need is the money to buy a new Travler Dish. Maybe once the cables are all run I'll get the motivation.

Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.

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Old 08-19-2009, 02:32 AM   #2
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Rick, there are a number of good sealants to choose from. Some are harder to remove if you need to. As long as the area is clean a good silicone caulk will keep the elements out of the compartment. Find a grommet that fits the cable (you can cut it if the plug end is much larger that the cable) and then drill the hole for the proper fit of the grommet. Close up the access with silicone and you are good to go.

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Old 08-19-2009, 05:23 AM   #3
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For roof sealant, most manufacurers use Dicor Lap Sealant. It is avaliable both as a self leveling and as a thicker mixture.
Adios, Dirk - '84 Real Lite Truck Camper, '86 Wilderness Cimarron TT, previously 4 years as a fulltimer in a '07 DSDP

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Old 08-19-2009, 06:02 AM   #4
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"Great Stuff"

Gooy sealants that never cure, will allow the wire to eventually move. National RV uses Dow Great Stuff around all wires, chases, pipes & drains. It is fireproof and will never move once cured.

You can buy it at any Lowes or Home Depot or for that matter, probably any hardware store in the US. It is designed to seal door jambs, window sill openings, or any other place in your house that you don't want cold air to come in.

Where I work, we use it to hold wiring in place for equipment that will be mounted on military vehicles such as Humvees and tanks. It is very light, but very strong.
Bill N8HDW & Nancy N8HDV
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Old 08-19-2009, 01:25 PM   #5
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Thanks all. I just picked up my gromets, hole saw and sealant so I'm ready to go. I was just looking for some validation before continuing.
Rick, Nancy, Peanut & Lola our Westie Dogs & Bailey the Sheltie.

2007 Itasca Ellipse 40FD
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Old 08-19-2009, 04:14 PM   #6
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In case you want to use that stuff auto parts stores usually have it, it's called buytl rubber or dumdum.

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