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Old 02-11-2018, 11:57 AM   #1
surfcheck101
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Cobra Kayak hull cracking-how to repair?

Good day all,

Was hoping to get a little information concerning kayak hull repair.

Neighbor gave me a Cobra Mariner XF Kayak in respectable shape however has to long cracks on the hull running lengthwise, approx. 6", under the seating area. Crack are completely thru the hull as noted in the attached photo. It appears a repair had been done before (I chiseled away the repair to see the crack better) and some duct tape placed over the top as well.

The question is is there any type of repair that would make this kayak ocean worthy?

My initial thoughts wer a good sanding, cleaning and plastic welding kit with HDPE welding rods to weld the cracks from the inside and out.is that the correct repair or not strong enough?

Any thoughts or recommendations more than welcome and appreciated.



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Old 02-11-2018, 12:28 PM   #2
battleborn702
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Re: Cobra Kayak hull cracking-how to repair?

plastic weld...
https://youtu.be/YNtICPFEY_8

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Old 02-11-2018, 02:14 PM   #3
rob102
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Re: Cobra Kayak hull cracking-how to repair?

I don't know all the differences in plastics, but because it's "structural" I would buy some plastic welding rod and use that for a filler material. If however there is an excess of plastic around the inside of the hatch, you can trim that off and use it since it is the exact same material.

For holes and cracks above the waterline, I have used plastic that I trimmed off of the lid of my garbage can.
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Old 02-11-2018, 08:27 PM   #4
batt
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Re: Cobra Kayak hull cracking-how to repair?

I believe the Cobra's are made with polystyrene. I've a couple of cobras and am interested indoor results.
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Old 02-11-2018, 10:23 PM   #5
Perchunter
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Re: Cobra Kayak hull cracking-how to repair?

Did not know fiber glass works too, maybe even better.
Check it out.

https://www.youtube.com/watch?v=cO_kRGFUJzY
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Old 02-15-2018, 01:03 AM   #6
Bob Ballew
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Re: Cobra Kayak hull cracking-how to repair?

flexing from weight more than the hull can handle appears to be the issue...unless the repair is sufficiently heavy to prevent more flexing, the problem may reappear. Two-part epoxy is far stronger than poly resin...I would try a few layers of cloth imbedded in the epoxy in an effort to solve the flexing issue. clean and sand the area first to ensure it will bond properly...
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