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Old 05-30-2016, 09:01 PM   #1
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Small hole in fiberglass roof

I noticed yesterday that there is a small tear in the fiberglass roof on the passenger side of the RV, probably from a tree branch. There appears to be an extruded aluminum strip behind the tear so it isn't well supported like it would be if it were on top.

Should I just put calk over it or should I put some tape on it first an then calk it?

The hole is about the size of a penny.

Ant recommendations? I have almost a week before rain is forcasted so I am not in a panic yet.
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Old 05-30-2016, 09:03 PM   #2
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Is there anything behind the hole for caulk to adhere to or is it just a hole?
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Old 05-30-2016, 09:11 PM   #3
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If it's a true hole in the fiberglass, you could fold a piece of cardboard or card stock and slip it in the hole and pull it up into some glue to hold it in place. Then with some fiberglass cloth and resin, you could patch over the hole. Build up a couple of layers and then when it hardens sand it back flush with the original roof. Then you'll have to paint or apply gelcoat to seal the patch. A boat yard or body shop could do the job for you and you wouldn't have to mess with the resin, glass and gelcoat.
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Old 05-30-2016, 09:16 PM   #4
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You don't need to put anything behind it. Just get a fiberglass repair kit and place 3-4 layers over it. Extend the edges of the fiber at least two inches past the edge of the hole.
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Old 05-30-2016, 09:20 PM   #5
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You don't need to put anything behind it. Just get a fiberglass repair kit and place 3-4 layers over it. Extend the edges of the fiber at least two inches past the edge of the hole.
I'd start with a piece of cloth saturated with epoxy under the hole first. Then you can worry about on top and fairing it out.
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Old 05-30-2016, 09:22 PM   #6
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It is really a teardrop shape rear and the fiberglass is still there. I could put a little calk behind it, then cover it in more calk to seal it. There is no gel coat, it's closer to a fabric material.
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Old 05-30-2016, 09:30 PM   #7
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i don't think I can get behind it without the risk of causing more damage.
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Old 05-30-2016, 09:33 PM   #8
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Another option is Eternabond tape. I would do this before trying to seal with caulk.
Fiberglass patch would be best but Eternabond will be almost as good for a repair.


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Old 05-30-2016, 09:57 PM   #9
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I am going to try the Eternabond tape. I just went through the data sheet and it appears to be the reasonable solution. I am concerned that putting epoxy soaked fabric over the tear is going to change the characteristics of the roof at that point. There are a couple of other spots on the roof that it may help with also.

Amazon to the rescue.

Thanks.
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Old 05-30-2016, 10:05 PM   #10
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My suggestions were for a fiberglass roof. What you are describing doesn't sound like fiberglass but perhaps EPDM rubber. Fiberglass doesn't usually tear, it fractures and cracks. Eternabond is a very good product, available in various widths. Be sure to clean the roof in the area with acetone to make sure it adheres well.
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Old 05-30-2016, 10:36 PM   #11
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2002, 34' Fleetwood Expedition has a fiberglass roof per online owners manual. I would fill the hole with quick-setting resin, then Eternabond over that. You might get some ideas from the Eternabond video library.
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Old 05-30-2016, 10:54 PM   #12
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The roof is a very thin fabric that appears to be related to fiberglass. I was told by the place we bought it that it was fiberglass and all the documentation says it is fiberglass. It is not a typical gel coated roof except for the end caps.

This is all new territory for me. I know a lot more about aluminum shell campers, silver Twinkie type, particularly older ones.
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Old 05-31-2016, 10:58 AM   #13
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Another option is Eternabond tape. I would do this before trying to seal with caulk.
Fiberglass patch would be best but Eternabond will be almost as good for a repair.


Steve
x2. Fiberglass repair would be the best. IMO next best is eternabond. Four inch wide if you can get it. Put it on with a "j" roller. They don't call it eterna for nothing. It will be a bear to remove when and if you decide to fiberglass.
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Old 05-31-2016, 11:19 AM   #14
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FWIW I have worked with glass cloth as thin as 2 oz/sq yard. It's common in the boat and aerospace industries. End caps seem to be chopped glass which is the heaviest and weakest glass laminate available. It is also the lowest cost. Laminated woven cloth with less resin is stronger and thinner for a given weight. It sounds like that is what your roof is. If it is that thin I would expect it was laid over a layer of plywood. You need the plywood for strength and the glass layer for water proof. Given the rest of the discussion the eterna bond seems like a reasonable fix.
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