patching sponsons

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treewater
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Posts: 144
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patching sponsons

Post by treewater »

I tried to patch the sponsons on my Citibot. I used air mattresses cement. It did not hold.
Any suggestions?

RangerTim
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Re: patching sponsons

Post by RangerTim »

You could try Aquaseal. If just a pinhole, you could get by without a patch. Note that Aquaseal is runny.
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GrnMtns
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Location: Northern Vermont,USA

Re: patching sponsons

Post by GrnMtns »

If it is just a seam try a hot iron first.
PM me if you want new ones.
Best,
Jon

Klepper A II
Pionier 520 Z
Klepper A 1

HoosierPaddler
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Re: patching sponsons

Post by HoosierPaddler »

You mention using a hot iron. Exactly how, without damaging the sponson? I am chasing leaks all over a Kodiak sponson. Latest is at the very end of one tube.

GIIx2, Kodiak, Edisto, Citibot

GrnMtns
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Re: patching sponsons

Post by GrnMtns »

The newer yellow Folbot Sponsons are pretty rugged. The iron has to he quite hot and applied briefly to the leak area. Experiment. You can reheat the area if it does not bond. I have only done it a few times and it seems to hold OK. I can have new ones made to exact lengths if yours won't hold air.
Best,
Jon

Klepper A II
Pionier 520 Z
Klepper A 1

HoosierPaddler
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Re: patching sponsons

Post by HoosierPaddler »

Unfortunately these are not the newer sponsons. This particular Kodiak is probably an earlier production run, vinyl or similar sponsons, blue aluminum longerons, poly frame members and hypalon hull. I'll try the iron.

How are you able to make sponsons? I've debated just searching for appropriately sized "pool noodles" or similar pipe wrap. I figure that might create issues put too much tension on the skin while assembling the kayak, zipping up the hull. Might have to use multiple sections.

Hoosier Paddler
GII x2
Kodiak
Edisto
Citibot

GrnMtns
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Location: Northern Vermont,USA

Re: patching sponsons

Post by GrnMtns »

Hi Jules,
I have a have 6" flat x any length sponson laminated poly material that we heat weld in the shop: http://sailyourkayak.com/replacement-sponsons/
Best,
Jon
Best,
Jon

Klepper A II
Pionier 520 Z
Klepper A 1

Alv
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Re: patching sponsons

Post by Alv »

The iron should work if the tube has welded seam, but you need to be careful. Start with a fairly cold iron, and crank up the heat gradually. You need to get the iron hot enough to melt the coating, but not so hot that you damage the substrate (the woven fabric). Press the seam together with the iron until the surfaces fuse together.

Good luck!

HoosierPaddler
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Re: patching sponsons

Post by HoosierPaddler »

This is the old style sponson, heavy, shower curtain like material. No woven fabric to worry about. The leak at the end of the tube is right along the interior edge of the previous (original) heating and cutting of the end of the sponson. Right along what would be a crease when you inflate the sponson.

HoosierPaddler
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Re: patching sponsons

Post by HoosierPaddler »

So since I had the Kodiak disassembled to deal with leaks at the aluminum rub strips screws (replaced all screws with new ones and new rubber and neoprene washers), decided to address the constantly leaking sponson. The older one is the one that I can’t get the leaks stopped. I’ve replaced them both with a small diameter pool noodle from Walmart. The diameter is smaller than the 2.75 of the older sponson. I used enough sections to match the length of the former sponsons. Debating cutting out a section from the circumference of each tube to allow more room for the foam tube to deform along the length of the assembled kayak. It has a nice round shape and since it was a little smaller diameter it didn’t create too much difficulties with assembly. I think if I had gone to 2.75 it would provide too much tension.
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RangerTim
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Re: patching sponsons

Post by RangerTim »

I just patched the end seam of an older (1990s) vinyl sponson using aquaseal. No patch but I did mix in a bit of xylene. After an overnight cure I inflated to my lung capacity. After 3 days holding air I called it good.
Ann and me
Folbots: Too many. It's embarrassing.
Feathercraft: Aeronaut
Klepper: AEI - Jonathan Waterman's boat
Hardshells x6

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