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06-04-2024, 08:43 AM
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#1
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Winnebago Owner
Join Date: Jun 2023
Posts: 62
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Which roof sealant to use (not the clear stuff)
I am aware of the roof radius and what it requires but there is a seal up over the awning side that is black/grey and needs replacing. I can't get a straight answer on what it is. I know dicor wont work on a fiberglass roof and that it needs to be self leveling silicone.
Will this work?
https://retail.usa.sika.com/en/produ...ling-sealant-0
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2016 Winnebago Aspect 27K
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06-04-2024, 09:06 AM
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#2
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Site Team
Join Date: Sep 2009
Location: Spring Branch, TX
Posts: 8,262
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Quote:
Originally Posted by FT RV
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I'm not sure I'd go with that, especial since its for filling cracks in concrete.
I know plenty of boats use a different Sika product... Sikaflex 291. But, it's not self leveling.
I'd guess that the existing product is Manus Bond 75am. However, it's not self leveling.
https://www.amazon.com/Manus-Product.../dp/B079Z2RH4M
I've used this to great effect. It lasts a very long time stays pliable. However, it's super sticky making it difficult to not get on everything and as I said, not self leveling so you must be super neat with it.
Currently, Winnebago says to use Henry's Roof and Gutter sealant or NuFlex 311. Both are Silicone and both are self-leveling.
Henry's is available in White, Clear and Gray via home depot:
https://www.homedepot.com/p/Henry-90...0204/202091012
NuFlex 311 comes in black - but it a bit harder to find:
https://pantherrvproducts.com/31113rv/
By the way, Dicor will work on fiberglass, the problem is that if you are using it over some existing silicone sealant it won't stick properly to the silicone. So, you can use it as long as it's new work not over older silicone sealant or some folks say if you clean every trace of silicone off the area you can use it successfully. What I know is that it is nearly impossible to remove all traces of silicone oils off of a previous application.
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2017 Winnebago Adventurer 37F
2016 Lincoln MKX Toad
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06-04-2024, 09:38 AM
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#3
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Winnebago Owner
Join Date: Jun 2023
Posts: 62
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I found the Henrys roof and gutter stuff, pretty sure thats the one
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2016 Winnebago Aspect 27K
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06-04-2024, 09:39 AM
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#4
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Winnie-Wise
Join Date: Nov 2002
Location: Anderson Creek, NC
Posts: 356
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These are the 3 main sealants that Winnebago currently calls out.
Nuflex 311 Self-leveling Silicone. This is for rooftop items.
Henry 212 Crystal Clear. This is for the roof side joints and almost everything else on the sidewalls.
Sika SG-10 Silicone. This is used as a bedding compound for the roof top items.
Aaron
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2014 Itasca Meridian 34B
2016 Coachmen Concord 300DS
2015 Focus Hybrid following along
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06-04-2024, 09:51 AM
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#5
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Winnebago Owner
Join Date: Jun 2023
Posts: 62
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In that case its the SG-10 ^
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2016 Winnebago Aspect 27K
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06-04-2024, 10:42 AM
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#6
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Winnebago Master
Join Date: Jul 2019
Location: Branson MO area
Posts: 746
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I am a firm believer in the sika products. The Sika flex is a great product and works as advertised. I have used it to caulk the seam on the front cap to roof and its held great for years. The sikaflex 221 is a great product
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07 Meridian 36G
Roadmaster tow dolly
Great Wife!! & Max the Frisbee chasing dog.
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06-04-2024, 11:57 AM
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#7
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Winnebago Master
Join Date: Aug 2001
Location: North America somewhere
Posts: 2,340
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Quote:
Originally Posted by FT RV
I am aware of the roof radius and what it requires but there is a seal up over the awning side that is black/grey and needs replacing. I can't get a straight answer on what it is. I know dicor wont work on a fiberglass roof and that it needs to be self leveling silicone.
Will this work?
https://retail.usa.sika.com/en/produ...ling-sealant-0
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Whoever told you self-leveling Dicor will not work on a fiberglass roof fibbed to you. It's silicone that will not adhere well-long term to surfaces.
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA. "We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln
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06-05-2024, 04:54 PM
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#8
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Winnebago Master
Join Date: Aug 2001
Location: North America somewhere
Posts: 2,340
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I forgot to say; if you insist on using silicone, only use neutral-cure silicone (the type that does not smell of vinegar)
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA. "We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln
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06-05-2024, 05:43 PM
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#9
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Winnebago Owner
Join Date: Jun 2023
Posts: 62
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Quote:
Originally Posted by Ray,IN
I forgot to say; if you insist on using silicone, only use neutral-cure silicone (the type that does not smell of vinegar)
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All the factory silicone was removed and replaced a little over a year ago, so the major seals are very good, its the other sections (rain gutters etc) that need replacing. AFAIK dicor wouldnt play well with any of the sealants Winnebago used
__________________
2016 Winnebago Aspect 27K
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06-06-2024, 03:29 AM
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#10
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Winnebago Master
Join Date: Aug 2001
Location: North America somewhere
Posts: 2,340
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Quote:
Originally Posted by FT RV
All the factory silicone was removed and replaced a little over a year ago, so the major seals are very good, its the other sections (rain gutters etc) that need replacing. AFAIK dicor wouldnt play well with any of the sealants Winnebago used
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You are right, nothing sticks to silicone residue, not even new silicone. That's why I removed the roof to gutter sealant and applied new sealant of a different brand.
__________________
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA. "We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln
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06-10-2024, 11:06 AM
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#11
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Winnebago Owner
Join Date: Jul 2023
Posts: 65
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Quote:
Originally Posted by creativepart
I'm not sure I'd go with that, especial since its for filling cracks in concrete.
I know plenty of boats use a different Sika product... Sikaflex 291. But, it's not self leveling.
I'd guess that the existing product is Manus Bond 75am. However, it's not self leveling.
https://www.amazon.com/Manus-Product.../dp/B079Z2RH4M
I've used this to great effect. It lasts a very long time stays pliable. However, it's super sticky making it difficult to not get on everything and as I said, not self leveling so you must be super neat with it.
Currently, Winnebago says to use Henry's Roof and Gutter sealant or NuFlex 311. Both are Silicone and both are self-leveling.
Henry's is available in White, Clear and Gray via home depot:
https://www.homedepot.com/p/Henry-90...0204/202091012
NuFlex 311 comes in black - but it a bit harder to find:
https://pantherrvproducts.com/31113rv/
By the way, Dicor will work on fiberglass, the problem is that if you are using it over some existing silicone sealant it won't stick properly to the silicone. So, you can use it as long as it's new work not over older silicone sealant or some folks say if you clean every trace of silicone off the area you can use it successfully. What I know is that it is nearly impossible to remove all traces of silicone oils off of a previous application.
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I agree with your advice. I just removed the manus bond n my 2022 Vista front cap since 1/2 of it was flaking off. Replaced with Nuflex.
And you are correct you can use DICOR if you remove the non-Dicor first. Recently the dealer had to remove my rear cap and replaced the sealant with Dicor.
I live in Arizona and the heat destroys sealant quickly. My roof radius sealant has been replaced twice in three years.
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06-10-2024, 01:14 PM
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#12
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Winnebago Owner
Join Date: Jun 2023
Posts: 62
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Supposedly Nu Flex 311 is now branded as "Hengs Self Leveling RV Silicone Caulk"
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2016 Winnebago Aspect 27K
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06-10-2024, 02:21 PM
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#13
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Winnebago Owner
Join Date: Jul 2023
Posts: 65
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Quote:
Originally Posted by FT RV
Supposedly Nu Flex 311 is now branded as "Hengs Self Leveling RV Silicone Caulk"
![](https://d2j6dbq0eux0bg.cloudfront.net/images/94604597/3964897692.jpg)
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Yes, I just purchased four tubes
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06-11-2024, 07:33 AM
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#14
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Winnebago Camper
Join Date: Nov 2023
Location: White Haven PA
Posts: 14
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Quote:
Originally Posted by wahoonc
These are the 3 main sealants that Winnebago currently calls out.
Nuflex 311 Self-leveling Silicone. This is for rooftop items.
Henry 212 Crystal Clear. This is for the roof side joints and almost everything else on the sidewalls.
Sika SG-10 Silicone. This is used as a bedding compound for the roof top items.
Aaron ![Coolsmiley](https://www.winnieowners.com/forums/images/smilies/coolsmiley.gif)
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Pardon my ignorance, but what is a bedding compound? And which roof top items would you use it on? For example a new sewer vent cap. The sika would go under the cap flange? and the Nuflex around the top of the flange? Thanks, George
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2015 Winnebago View
1999 Airstream 31ft. Classic
1976 Airstream Argosy
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06-11-2024, 01:17 PM
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#15
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Winnie-Wise
Join Date: Nov 2002
Location: Anderson Creek, NC
Posts: 356
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Quote:
Originally Posted by Gkiesel
Pardon my ignorance, but what is a bedding compound? And which roof top items would you use it on? For example a new sewer vent cap. The sika would go under the cap flange? and the Nuflex around the top of the flange? Thanks, George
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Correct. You put a heavy bead of the SG10 under whatever it is you are installing. Then use the Nuflex around the edges and over the fasteners. If you have ever looked at the stuff on the roof you will notice they are quite generous with the Nuflex. I suspect the factory buys it in 55-gallon drums.
Aaron
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2014 Itasca Meridian 34B
2016 Coachmen Concord 300DS
2015 Focus Hybrid following along
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06-12-2024, 11:28 PM
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#16
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Winnebago Owner
Join Date: Jun 2023
Posts: 62
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I used the SG-10 along the base of the shower, its WAY better than the residential grade white stuff. Not as easy to work with and has to be prepped well but its a way better seal and will last for years. Cleaned out the roof gutter sealant too, looks like they used pro flex which dried out and cracked. Replaced with Sikaflex 221.
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2016 Winnebago Aspect 27K
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06-14-2024, 06:33 PM
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#17
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Winnebago Camper
Join Date: Nov 2023
Location: White Haven PA
Posts: 14
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Can you get SG10 in White? I like the shower idea. Mine needs to be recaulked. Thanks.
__________________
2015 Winnebago View
1999 Airstream 31ft. Classic
1976 Airstream Argosy
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06-15-2024, 07:24 AM
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#18
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Winnie-Wise
Join Date: Nov 2002
Location: Anderson Creek, NC
Posts: 356
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Quote:
Originally Posted by Gkiesel
Can you get SG10 in White? I like the shower idea. Mine needs to be recaulked. Thanks.
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It comes in clear, white, and black.
I found it on Amazon in White for ~$26 a tube. I would try a local supply house.
Aaron
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2014 Itasca Meridian 34B
2016 Coachmen Concord 300DS
2015 Focus Hybrid following along
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06-15-2024, 06:36 PM
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#19
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Winnebago Owner
Join Date: Jun 2023
Posts: 62
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My shower is white and the clear applied is transparent, you can barely see its there. I think white would stick out more. I am certain this stuff will perform far better bouncing down the road over residential grade stuff.
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