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Old 12-18-2014, 09:31 AM   #15
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Real silicon...RTV sticks well to darn near anything if properly done.

Clean and dry are a must.

If there is any condensation or oil film it will fail.

Aquariums are built with only that so it does work.

Prep mating surfaces with alcohol and make sure clean and dry then light bead on one side and install.
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Old 12-18-2014, 12:07 PM   #16
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I use Butyl tape on all mine, works for the vents ect.
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Old 12-18-2014, 08:33 PM   #17
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The MH ceiling fans do not have the volume/capacity to pressurize the MH to 2-3 psi, which is what the SealTech System does very well. Remember the air loss around slideouts, windows, and the door must be overcome before any internal pressure occurs. The fan SealTech uses looks like a 24" squirrel-fan with an 18" flexible hose attached to a roof vent opening. This system DOES WORK as advertised. Of course the thoroughness depends on the operator/RV technician.

I too recommend removing clearance lens and inspecting for leaks. A couple of mine leaked, and I discovered water was entering the lens, but dirt/dust had sealed the bottom half of the lens/housing surfaces. This allowed water to build-up in the lens until it reached the wiring hole through the base , through the end cap, and down the inside of the cap. My solution was to seal the end cap wiring hole with butyl tape and drill a 1/8" hole in the bottom of the lens to prevent water accumulation.

Quote:
Originally Posted by TQ60 View Post
Real silicon...RTV sticks well to darn near anything if properly done.

Clean and dry are a must.

If there is any condensation or oil film it will fail.

Aquariums are built with only that so it does work.

Prep mating surfaces with alcohol and make sure clean and dry then light bead on one side and install.
Been there done that. After a year or longer you can grab one end of a bead of silicone/RTV with pliers and pull the entire bead away from the hard surfaces. It will not adhere long-term to slick surfaces, and those surfaces must be cleaned with a special cleaner before more silicone/RTV will stick again.
I will never use silicone sealants again on my RV.
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Old 12-18-2014, 11:04 PM   #18
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It amazes me when people say silicone doesn't work on an RV. Look at almost any DP. All of the moldings are installed and sealed with silicone, along with the windows and doors. If you don't believe me, just look at one.

If it's applied to a clean surface you'll spend all day trying to get it off.
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Old 12-18-2014, 11:22 PM   #19
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I would think you need to turn on all the air conditioners and make sure everything is sealed, like the heat vents and the small heat outlets. Also you'll get air going out the slides. I would keep the slides in while doing this. They do this on houses to find out where air is escaping to the outside.
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Old 12-19-2014, 09:19 PM   #20
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Quote:
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I would think you need to turn on all the air conditioners and make sure everything is sealed, like the heat vents and the small heat outlets. Also you'll get air going out the slides. I would keep the slides in while doing this. They do this on houses to find out where air is escaping to the outside.
Don't air conditioners and furnaces re-circulate interior air instead of pulling in outside air? How would that pressurize the coach, or house for that matter?
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Old 12-23-2014, 02:53 PM   #21
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Unfortunately the clearance lights weren't the source. I made an appointment to have a negative pressure test completed since it doesn't sound like it's something I'll be able to do myself at home.

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Old 12-23-2014, 03:11 PM   #22
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Quote:
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It amazes me when people say silicone doesn't work on an RV. Look at almost any DP. All of the moldings are installed and sealed with silicone, along with the windows and doors. If you don't believe me, just look at one.

If it's applied to a clean surface you'll spend all day trying to get it off.
You are 100% correct Don.
However, not all Silicones are the same. When I was sealing my new marker lights, I spent a lot of time reading the back of the product to find the proper one. I ended up with a Marine selection that is compatible with moisture and extreme temperature changes.

During the replacement process, I had to reseal the joints between the rear cap and the roof. These still had the OEM Silicone from 2003. I can tell you it was no push over getting the old stuff out.
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Old 12-23-2014, 03:15 PM   #23
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There is silicon then there is silicon RTV tgen a few others

The folks at local box store had no clue what RTV was...

Do not get the latex stuff
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Old 12-23-2014, 09:21 PM   #24
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If you watch the Foretravel Relm video, about 4:27 into the movie he says they use no silicone on the MH. Must be a reason.
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Old 12-25-2014, 10:59 AM   #25
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I have the same leak issue on my 2002 Eagle. Here is the weird thing. It doesn't leak every time it rains. This has been puzzling me for a long time. Even in hard rains when it does leak, it only leaks enough to get a paper towel damp. I tried running water on the windshield one time and got nothing. This had me thinking marker lights. Nope. I tried my own air test and got no bubbles with soapy water. I had the passenger side windshield caulk redone twice. Still leaked occasionally. I finally scheduled a Sealtech test at Mesa RV about a week ago. Before they hooked anything up the techs hit the front windshield with a hose. Bingo, water leak found at the very spot that had been resealed twice. I will now have the windshield removed and resealed.

It was strange how this happened sometimes it rained. I think the hole is so small that contraction and expansion with heat may have something to do with the intermittent leak.

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Old 12-25-2014, 01:42 PM   #26
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3m 5200. that is the stuff McGregor used to build their boats. black around the windows and white for everything else. HOWEVER it is not as easy to use. little working time and needs chemicals to clean up. took days to get off my skin but the window never leaked again.
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Old 12-26-2014, 09:02 AM   #27
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I also have one of those leaking marker lights. I re-watched the video about silicone and at 4.27 he says a "bead of silicone" I have heard that you are not to use it on your MH, after I used some, now he says they used it.
If I have to take them off and clean and reseal then I am going to replace them with LED's. I like the idea about using Plumbers Putty???
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