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Old 10-28-2023, 11:03 AM   #1
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Eternabond strength

This is not a Jayco or even RV question per se. I have an older Yakima Rocketbox that has a split in the top half near a hinge. I'm trying to figure a way to salvage it as new ones are expensive. I have tried an epoxy solution that just cracked along the same line. It may be that I end up needing some kind of fiberglass repair kit, but before buying one, I thought I might use some Eternabond tape inside and out to act as both a repair and sealer for the crack. Am I crazy to hope it will be strong enough?
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Old 10-28-2023, 11:10 AM   #2
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Unsure of the pressure acting on the split, but Eternabond is quite strong. It is a tape though so not invincible. I have used it on a leak I had on a previous fifth wheel roof and it stayed put for years.
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Old 10-28-2023, 11:15 AM   #3
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I would have to see it, but I'd consider pieces of fiberglass mat or cloth on both the inside and outside of the crack, along with JB Weld. A layer of JB, the cloth, and another layer of JB on top. I'd do one side at a time, and give it a coat of semigloss black paint to finish.

If it's made of plastic, there are plastic welding kits on Amazon that may do a good job too.
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Old 10-28-2023, 11:45 AM   #4
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Actually I tried JB weld by itself already and that didn't work at all. But it's not the best use case for that product.
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Old 10-28-2023, 01:30 PM   #5
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Eternabond will loosen if stretched, so if that is a possibility it would not be a good solution.
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Old 10-28-2023, 01:33 PM   #6
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ABS cement has worked well on rocketbox repairs I've done. I put Gorilla tape (strong duct tape) on the inside after giving the cement time to cure.
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Old 10-28-2023, 06:21 PM   #7
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If it is fiberglass, just get one of the fiberglass repair kits from Amazon. They are pretty easy to use . I used one to repair a crack in a kayak. By the time you experiment with things that end up not working, you could have already fiberglassed it. Be sure to get a pair of scissors that can cut fiberglass.
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Old 10-28-2023, 06:23 PM   #8
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I don't think any of Yakima's Rocketboxes were ever fiberglass. Packasport is the only company that I know that has done a fiberglass roof box.
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Old 10-28-2023, 06:40 PM   #9
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Here you go! https://youtu.be/8AqLnt0FolQ
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Old 10-31-2023, 08:36 PM   #10
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The best way to fix cracked plastic is to weld it. I have welded several plastic parts and it doesn’t recrack. I use my soldering iron.
If you need to see the video I learned from, let me know and I will try to find it for you.
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Old 11-01-2023, 09:00 AM   #11
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Quote:
Originally Posted by Kevin Cooper View Post
The best way to fix cracked plastic is to weld it. I have welded several plastic parts and it doesn’t recrack. I use my soldering iron.
If you need to see the video I learned from, let me know and I will try to find it for you.
X2 You can buy a plastic welding kit on Amazon.

How I do it is apply metal duct tape to the visible side to align the panel and hold it all together. Plastic weld the back side. Then remove the tape, apply new tape to the backside to give some support. Then plastic weld the front side.

There is plastic welder stapler option if you need additional support.
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Old 11-04-2023, 02:33 PM   #12
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I used to sell Eternabond at a commercial roofing distributor. Unless the shell is completely split in half from end to end, it will probably work for a while if you tape both the outside and inside. Make sure you use the cover tape and not the in-seam tape. If it is completely split into two separate pieces it will not work.
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Old 11-04-2023, 03:20 PM   #13
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I don't know about how well it would work on hard plastic but was very pleased that after 3 years my son's pool cover tarp repairs are still holding up in perfect condition. The tarp is a very robust material that mice chewed holes in during summer storage. We used two pieces of Etearnabond and patched on both sides with an almost 2 inch hole in the middle of the patches. No sign of failure after freeze, thaw, stretching and storage in a shed during the summer. Maybe the glue meeting in the middle has helped as the bond is very good.
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Old 11-05-2023, 07:47 AM   #14
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Some great tips here thanks for all the replies! I used a Bondo fiberglass repair kit and though it's ugly as heck, it seems like it will be plenty strong. I'll have to do a little cutting of the excess fabric but otherwise I'm pretty please. I'm not concerned at all about looks lol. I'll remember these plastic welding tips too that might come in handy.
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Old 02-09-2024, 08:14 PM   #15
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another follow up

attached pic of the ugly but strong fiberglass patch.
Attached Thumbnails
IMG_0384.jpg  
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