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Spanke 09-12-2012 03:53 PM

How to seal around incoming wiring
I have finally remounted the body to the frame on my Trillium 1300. There are numerous wires that enter the trailer near the front on the underside. (brakes/battery/breakaway switch/and connection to the TV)

My question is what is the best way to seal around the wires to make the hole and wires watertight. Originally there was a blob of black, sticky, tarry looking stuff that you molded around the wires and the hole. I'm not sure what that stuff is called.

If anyone can give me some suggestions on what to use, I would greatly appreciate it.



mary and bob 09-12-2012 04:04 PM

I used fiberglass resin and cloth. How about some kind of caulk in a tube?

Eddie Longest 09-12-2012 04:05 PM

More than likely they used butyl tape as a sealer.

rabbit 09-12-2012 04:17 PM

I like OSI QUAD Advanced Formula (windows, door & siding). It's a gun caulk which adheres very well to wood and fiberglass and remains flexible. Available big box home improvement centers.


Thomas G. 09-12-2012 04:33 PM


Originally Posted by Eddie Longest (Post 333344)
More than likely they used butyl tape as a sealer.

That would be my choice.

Raz 09-12-2012 05:25 PM

I've had good results using Lexel. It readily adheres to fiberglass, but can be removed should the need arise. Raz

Darwin Maring 09-12-2012 05:41 PM

Our camper was sealed at the factory with expanding foam. You can get it at Lowes, Home Depot, WalMart.

Jeff Richardson 09-12-2012 06:24 PM

I recently moved the 7-conductor cable so it enters the body of my 1977 Scamp over the right-side frame rail. I ran a 3/8" O.D. propane line through the original 4-conductor wiring hole with a brass bulkhead fitting.

I searched for a better way of running the 7-conductor cable through the shell and found Ancor wire seals which are sold at marine supply stores. Ancor must be a division of the Marinco company. Here's a link to the Marinco web site:

Wire Seals | Marinco

I bought the 765004 from a local marine store because they didn't charge shipping for in-store pickup. My local West Marine store doesn't carry that size. It was about $15.

I was able to get the smaller 765000 size at West Marine which I will use for battery wiring and brake wiring coming up through the floor.

There is not enough thread length on these to go through the plywood floor so I will mount them on an aluminum plate with clearance hole to clear the body of the seal. There is enough thread length to go through the fiberglass body.

Installing the wire seal for the 7-conductor cable was one of the quickest mods I've done. I used a hole saw and then opened it up a little with a round file for a tight fit.

It doesn't take much torque to seal and secure the cable plus is comes back apart very easily. No goopy sealant to deal with. It is waterproof to 300 ft. underwater.

I will try to post pictures tomorrow.


Spanke 09-13-2012 12:24 PM

Thanks for all the replies.

I had thought about using butyl tape, but was wondering how I would get it down inside a bundle of many wires.

The OSI Quad and the Lexel look to be very similar. I like that they stay flexible and will stick to about anything. I'm leaning that way. :thumb


ThomasE 09-13-2012 12:27 PM

I used regular old household latex caulk in a tube. Expanding foam would work well too, but it's very hard to remove if you need to later.

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