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Old 07-07-2014, 03:44 PM   #1
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What kind of sealant to use?

I'm going to replace my amber clearance lights on top of the front cap,can I just use clear silicone or is there something better. Thanks in advance
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Old 07-07-2014, 03:54 PM   #2
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If your lights are on the flat part of the roof, I'd recommend Dicor Self-Leveling Lap Sealant. If they are on the curved part of the front cap, I'd be looking for a top quality silicone.
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Old 07-07-2014, 05:22 PM   #3
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No silicone. The roof area moves somewhat as you are going down the road and silicone doesn't like to move and it can crack and then you will have to replace it again. We've had to replace the silicone the previous owners had used on the roof in places. It's a pain to get off and not the best to use on things that can move like the roof.
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Old 07-07-2014, 05:29 PM   #4
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If you can't use silicon then what would you use in its place? Mine are on the curve part of the roof and I need to replace one of mine just as OP has to do. I don't know of anything other than silicon to seal with.
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Old 07-07-2014, 05:40 PM   #5
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The key question is what is the marker light mounted on? iI would imagine they are mounted to the fiberglass front cap itself? if so clean both surfaces and use silicone sealant. if it is mounted to the rubber roof then the use of a rubber safe sealant would be required, Dicor makes some of the best roof sealants. I cannot think of any manufacturer that mounts clearance lights on the "roof" portion of any rv.
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Old 07-07-2014, 08:12 PM   #6
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Sealant

I like 'Quad' from Lowes, it's a polyurethane and works on all surfaces does not harden or shrink, works alot better then Silicone
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Old 07-07-2014, 10:25 PM   #7
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Quote:
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I like 'Quad' from Lowes, it's a polyurethane and works on all surfaces does not harden or shrink, works alot better then Silicone
I agree that polyurethane is a superior product for this application. I installed new clearance lens on my MH's front cap some 4 years ago and used a polyuretnane caulk. Installation still looks good and is water tight. Silicone is not a good sealant for this use.
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Old 07-08-2014, 04:46 AM   #8
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Clear Proflex after being cleaned with ammonia based cleaner.
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Old 07-08-2014, 08:16 AM   #9
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Thanks for the replies. Now that I know there is something other than silicon that will work for fiberglass I will give one a try. Appreciate the info!
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Old 07-08-2014, 10:47 AM   #10
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Quote:
Originally Posted by Melmoses View Post
Thanks for the replies. Now that I know there is something other than silicon that will work for fiberglass I will give one a try. Appreciate the info!
Me Too! Thanks!
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Old 07-08-2014, 11:09 AM   #11
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Polyurethane (like 3M 5200) should only be used on items you will never have to separate...ever. In the boating community it is use for deck to hull joining, but never for an item that might have to be taken apart at a later date. Trying to separate polyurethane from fiberglass normally results in the fiberglass tearing before the seal breaks.
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Old 07-08-2014, 11:13 AM   #12
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The biggest disadvantage to using silicon caulks is that after the initial application, you can't simply apply over it to reseal a crack. Silicon, by nature, is slick and won't stick to itself if it needs to be resealed; that's why, by and large, RV manufacturers don't use it. Won't hold up well, can't be easily resealed. There is a whole slew of RV specific caulks (Dicor is one of the biggest) designed for sealing up RVs and keeping them sealed.

That being said, if I can't get hold of an RV specific sealant, then I'll use a butyl rubber caulk first and a polyurethane caulk if I can't find the butyl rubber. Polyurethane is tough, but, the "jury" is still out on how well a recoat will hold up, while butyl rubber is equally tough, flexible, great adhesion and will easily stick to itself if an emergency re-coat is necessary. It is used primarily in the building industry, metal roofing and guttering in particular where expansion and contraction along with direct exposure to the elements are concerns; very much like an RV. I've always been under the impression that the RV centered sealants (Dicor and its ilk) are actually just butyl caulks with some other additives to extend their useful life even further as they behave very similarly.
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