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Old 09-25-2014, 10:30 PM   #1
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Roof sealant questions

I removed all of my plumbing (black & gray) vent covers and scraped all the old Dicor off and wiped clean with mineral spirits in preparation to install new covers. I have a fiberglass roof. Once everything was completely clean I noticed an area on the fiberglass around each pipe that appeared like clear fiberglass resin. Very thin and perfectly smooth like glass. At first I thought that's what it was because it was so perfect in it's application. I wanted to make sure it was not the dreaded silicone that everyone talks about so I tried scraping it with a razor. To my surprise it did not budge much but I was able to scrape a sliver off and it did not feel like glass at all but possibly a sealant. I doubt the previous owner applied this as I think the covers are original. Would the Newmar factory applied a silicone sealant? Since this sealant was under the vent cover base I see no benefit to it being there at all. The pipe itself has a nice coat of what appears to be Dicor around the pipe base to seal the hole in the roof where the pipe penetrates. Should I try to remove this clear sealant or whatever it is before I install the new plastic vent cover and seal with the Dicor? Whatever it is it is attached so well that I will most likely need to try sanding it off. I also removed the Dicor around one of the luggage rack brackets and screw. Once the Dicor was removed and cleaned I found this same sealant underneath. Anyone see this on their coach from the factory and know what I'm dealing with. This stuff is applied very fine and smooth. It does not seem like the rubbery silicone sealant that I'm used to but it's hard to figure out what it is. It's not applied in a bead but is more like it was a clear self leveling substance.
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Old 09-26-2014, 06:13 AM   #2
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Could it have been a gasket material that they used under the items they installed? Like a putty material you buy in a roll about 1/2 inch wide?
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Old 09-26-2014, 08:24 AM   #3
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It could be a product called Sikaflex, which is a polyurethane sealant. We use it when we do roof repairs at our dealership, then apply Dicor over that.


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Old 09-26-2014, 10:22 AM   #4
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My guess is that it may be the original unweathered finish that was on the roof when it was new
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Old 09-26-2014, 10:44 AM   #5
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I doubt it is an unweathered finish that was applied on the entire roof. There would have been a bigger area of this under the Dicor if that was the case. My biggest concern is making sure it's not silicone. I'd rather not spend the time to remove it unless I must. If this is silicone it's not like any I have seen before granted I'm not a sealant expert. Brian might be right about it being Sikaflex. If you applied a layer of clear box tape that would be what the finish would look and feel like with the edges feathered with no lip at all. Whatever it is, it has a nice clear hard feathered finish like glass. Definitely not any kind of gasket material like someone mentioned. I'm sure I'm over thinking it and the Dicor covering it completely and not just butting up should be good. I might be a little more concerned about applying Eternabond over this slick area. Fortunately there is none associated with the cap seams that run along the 4 corner edges with the metal strip and screws with the Butyl gasket material underneath. That is where my Eternabond tape will be used and might also remove the Dicor off the skylight to make the surface more flat and apply the Eternabond there also.
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Old 09-26-2014, 10:58 AM   #6
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Maybe ProFlex or Sikalfex? I don't think they have C10 in clear.
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Old 09-26-2014, 11:21 AM   #7
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My guess is that it may be the original unweathered finish that was on the roof when it was new
I'm curious about this. What type of finish was applied when new that could be existing under the Dicor? Are you suggesting this finish was on the entire roof and somehow completely weathered off with no sign of it anywhere except under the Dicor?
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Old 09-26-2014, 11:50 AM   #8
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I think I'd just put a little dab of Dicor (or whatever you're planning on using) on the clear material, wait till it dries and see how well it sticks to it. That should tell you what to do next.
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Old 09-26-2014, 12:04 PM   #9
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I think I'd just put a little dab of Dicor (or whatever you're planning on using) on the clear material, wait till it dries and see how well it sticks to it. That should tell you what to do next.
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I considered this as well. Good advice . I'll be using Dicor.
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Old 09-26-2014, 08:50 PM   #10
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Is C10, Sikaflex or Proflex not a better option then Dicor on a fiberglass roof?
Just curious why so many replies on Dicor???
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Old 09-26-2014, 08:55 PM   #11
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Is C10, Sikaflex or Proflex not a better option then Dicor on a fiberglass roof?
Just curious why so many replies on Dicor???
Not sure. This is my first rodeo. Dicor is a nice product that is easy to apply and reapply later. The self leveling also makes neat work. Lots of discussion on this subject.
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Old 09-26-2014, 09:02 PM   #12
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Is C10, Sikaflex or Proflex not a better option then Dicor on a fiberglass roof?
Just curious why so many replies on Dicor???
Because CW sells it ;-)

I wonder the same. Sikaflex has about every sealant and adhesive anyone could need. I'm sure they aren't the only ones. Today, there are just too many formulas, in fact so many it's hard to decide which one is best for a specific application and material.
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Old 09-26-2014, 10:19 PM   #13
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Takes a long time for sikaflex to set up 6 or 7 days. Dicor is good. However, some of it depends on your RV color. If it can be seen on RV and your RV is not white. Possibly black, like mine. Proflex black may be a better option since Dicor doesn't come in black. Top of roof probably doesn't matter. As it rolls over the side near the drip line it does. Unless you want to re-paint over the white or grey Dicor. JMHO
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Old 09-26-2014, 10:52 PM   #14
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Takes a long time for sikaflex to set up 6 or 7 days. Dicor is good. However, some of it depends on your RV color. If it can be seen on RV and your RV is not white. Possibly black, like mine. Proflex black may be a better option since Dicor doesn't come in black. Top of roof probably doesn't matter. As it rolls over the side near the drip line it does. Unless you want to re-paint over the white or grey Dicor. JMHO
Glad you brought up over the side. So far all my sealant work is on top but over the side is next. What is a good sealant to use on the seams on the sidewalls. My coach is white above the storage bays so color is not a problem.
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