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Old 12-03-2021, 03:00 PM   #1
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Sealant question!

So I had a front clearance light that burned out and my rear red lenses where faded bad, just bought the couch in September..

So I found a LED light that was acceptable to me and fit the opening and screw pattern so weíre replacing all of them, front and rear and the two side marker lights,

So the question is, does anyone know what sealant Monaco used on these, 16 years old and itís still pliable!

Any recommendations would be appreciated!
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Old 12-03-2021, 04:21 PM   #2
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I replaced the clearance lights on our motor home. The originals were in poor shape and cracking.
I found new light assemblies online. My original lights were sealed onto the coach with silicone sealant. They were sealed around the perimeter of the light housing and around the hole for the wires was also sealed.
I had to pry the old lights off and then scrape the area clean. I used a pair of hemostats to hold the wires from pulling back into the hole.
5 red across top rear
5 yellow across top front
I also replaced the side market lights with new light assemblies that had two LED bulbs.
Hope this helps.
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Old 12-03-2021, 04:52 PM   #3
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My lights were siliconed around the edges and even up onto the outsides of the lenses and I did have to pry the fixtures off too, that sealant around the back of the fixtures is different than the silicone on the outside, itís yellow now and actually still gummy! Strange stuff! There was also Duct Seal on the back side of the screws that fasten the fixtures to the body!

Any more suggestions are welcome!
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Old 12-03-2021, 06:50 PM   #4
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I have had RV's with butyl sealant. Could that be what is.
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Old 12-03-2021, 08:05 PM   #5
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Butyl tape is now my go to bedding method... stays flexible, good adhesion and seal. To future adhesion problems ad with silicone.
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Old 12-03-2021, 08:48 PM   #6
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You just reminded me. The stainless steel screws also had silicone sealant. Mine had clear that had slightly yellowed.
It held up well under the light fixture for 17 years.
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Old 12-04-2021, 12:51 PM   #7
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Aquarium silicone is good stuff, no acetic acid to corrode metals. Seen 40 yr old aquariums still hold water with UV lamps on them. Sticks to old siliconed areas.
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Old 12-05-2021, 08:34 PM   #8
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Finished the light replacement this morning, I ended up using regular Silicone as the sealant, put a bead around the hole in the coach and a bead on the back of the light fixture to match up with the bead on the coach then sealed the outside of the fixture just like when the coach was manufactured. It appeared that Monaco also used Duct Seal on the screw holes in the coach so I did that also!

Thanks for everyoneís advice.
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Old 12-08-2021, 10:52 AM   #9
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Quote:
Originally Posted by 153stars View Post
Aquarium silicone is good stuff, no acetic acid to corrode metals. Seen 40 yr old aquariums still hold water with UV lamps on them. Sticks to old siliconed areas.
That is naturally curing silicone. I get it a a commercial caulk shop. Big box always seems to have the acid curing stuff, which cures in a few hours.

Naturally curing cures at about 1/8" of depth per 24 hrs depending in temp. Cold weather lets say 32 degrees "F", may 1/8" in a week. Depth measured from where air makes contact with caulk.
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Old 12-08-2021, 10:59 AM   #10
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Quote:
Originally Posted by Winemaker2 View Post
Butyl tape is now my go to bedding method... stays flexible, good adhesion and seal. To future adhesion problems ad with silicone.
I think is the best for duration. Only issue I have seen with it. dark streaks on the siding below it, which can be a pain to clean.
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