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Old 03-21-2019, 07:57 PM   #1
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Eternabond on fiberglass

Need to seal the seems at the front and back caps, everything I see is eternabond is for rubber roof, will this work on my fiberglass roof, also can it be covered over with the roof coating?

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Old 03-21-2019, 08:04 PM   #2
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Don't know about your brand, but Newmar seals fiberglass roof seams with Dicor. And a fiberglass roof does not need roof coating. Don't do it. The GelCoat just needs to be cleaned and waxed once in a while.

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Old 03-21-2019, 08:05 PM   #3
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I don't see why not. But surface preparation is critical! Use their cleaning and prep instructions.
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Old 03-21-2019, 08:48 PM   #4
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Take a small piece of the Ertnabond and “accidental” touch the seal part against a unprepped piece of fiberglass then try pulling them apart and you’ll get a good idea of how well the two surfaces will bond.
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Old 03-21-2019, 11:29 PM   #5
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Eternabond works perfectly fine on fiberglass roofs. My Newmar diesel pusher came from the factory with eternabond sealing the front and rear caps to my fiberglass roof.
The Eternabond website advertises that it works on almost all materials and has instructions on how to clean the surface and install the product.
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Old 03-21-2019, 11:41 PM   #6
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Tiffin also uses it to seal the front and rear caps and many Winnebago owners have used it on their roof channels for years.
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Old 03-21-2019, 11:49 PM   #7
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Eternabond is awesome. I used it all the way around the roof on my Travel Supreme. The Dicor I used around the vents is due to be replaced again soon yet the Eternabond still looks fresh.
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Old 03-22-2019, 03:32 AM   #8
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I use it to seal the seam between the rubber roof and the fiberglass front and rear cap. No problems sticking to either surface as long as it is clean. Front seal is well over five years old and no signs of deterioration. Rear is a few years newer. Coach is parked in the driveway uncovered in whatever the day to day weather might be.

To help with placement of the tape, considering you'll be putting down potentially a 9' run that works best without seams, mark where you want the edge of the tape in relation to the seam you are sealing along the run. Once the tape is in place you can not pull it up and reposition so if you start to wonder off center correcting can be difficult. Having something to guide you as the tape goes down will prevent such. A chalk line, blue painters tape, ink marks every 6 inches or something as such.
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Old 03-22-2019, 06:40 AM   #9
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Works great on fiberglass/gelcoat, I used it to hold down my solar panel brackets so I didn't have to drill more holes in the roof. If you need to remove it here is a video that can help.


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eternabond, fiberglass

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