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#2263164
On my last trip to Matagorda I developed a leak (a bad leak!!) in my Native Manta Ray kayak. Upon inspection I found 2 stress cracks (one about 1 1/2 half inches long and the other about 2 inches long) both are right next to the scupper holes in the middle of the kayak under the seat. I was thinking about fiberglassing the cracks to add strength, but for what I have been reading fiberglass and plastic don't mix. I was thinking just welding plastic would not be strong enough to keep the cracks from forming again.

Any ideas on how to fix these cracks?
#2263169
I got the kayak used and I checked the website of the manufacturer and no such luck. I am afraid that the "plastic welding" I have seen on youtube will not keep the cracks from forming again. Long run I am getting a new kayak, but I need this one to last a little bit longer. Just looking for ideas.
#2263177
What model year is the kayak?

I've heard of other manta rays developing cracks at the scuppers in the seat pan in the past. First thing I would do is drill stop the cracks to prevent them from getting longer. Plastic welding around scuppers is tricky. If you attempt it you can get some pieces of plastic from the inside lips of hatches so the color matches. Since there's access behind the seat I would silicone in closed cell foam blocks under the seat pan for support, too.
#2263178
As suggested, drill a hole at the end of each crack to prevent further cracking. Slather in 3M Marine Sealant 5200 to fill the cracks. It's a polyurethane polymer so it adheres to plastic well, stays flexible and watertight, and is designed to form a permanent bond or seal below the waterline. It's used on through-hull fittings.
#2263202
Darkarcher159 wrote:I got the kayak used and I checked the website of the manufacturer and no such luck. I am afraid that the "plastic welding" I have seen on youtube will not keep the cracks from forming again. Long run I am getting a new kayak, but I need this one to last a little bit longer. Just looking for ideas.


There are videos on people using wire mesh to weld over the cracks to give it more support. Look around YouTube. Do a thorough search with words that may be used to weld plastic of different kinds.
#2263263
TG05 wrote:As suggested, drill a hole at the end of each crack to prevent further cracking. Slather in 3M Marine Sealant 5200 to fill the cracks. It's a polyurethane polymer so it adheres to plastic well, stays flexible and watertight, and is designed to form a permanent bond or seal below the waterline. It's used on through-hull fittings.


Yeah that’s a good to-do also to prevent the cracks from forming again. I’ve had to do the same thing on my KC on the top half.


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