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ContinuousWave: Whaler Repairs/Mods
Plastic Repair With Epoxy
|Author||Topic: Plastic Repair With Epoxy|
|R T M||
posted 01-04-2010 05:20 PM ET (US)
Thinking of using epoxy and mat and cloth to patch a few holes in a plastic kayak. Does anyone know if epoxy will stick to plastic? Will the elasticity of the plastic pop the epoxy patch off? the only thing Whaler related here is I would take the kayak aboard my 13 footer to some grass flats and do some kayak fishing.
posted 01-04-2010 06:02 PM ET (US)
hey Rich-can you find out what kind of plastic it is? I say that because if it is polypropylene you can get it welded-they use a stream of very hot air and plastic rod.
here is something I found on google
good luck or maybe try a flexible epoxy! -g
posted 01-04-2010 06:03 PM ET (US)
And drill down to Projects / Boat Repair / Plastic Boat Repair
and look for the article "Repairing a Royalex Canoe with G/flex Epoxy".
I don't know what material your kayak is, but this might be a start.
Regards - Don
posted 01-04-2010 07:19 PM ET (US)
Rich, is it one of the newer rotomolded kayaks? If so it is polyethylene and repairs can be made by heating the area gently and adding some melted PE from a stick or piece of the same. The PE is too flexible and elastic for epoxy to stick very long. A patch using Gorilla glue is also possible if you are not looking for pretty. Good luck!!
posted 01-04-2010 08:24 PM ET (US)
Most plastic kayaks are crosslinked polyethylene. Epoxy will not adhere for very long if at all. The West article on the canoe is a different material (Vacuum formed ABS), and epoxy will work on that. The only way to fix the polyethylene material is with a heat gun and the proper welding stick material, and it takes a good deal of experience to achieve the proper bond without melting the kayak and making things worse. My company used to build chemical plating tanks using this method. You might try to find a fabricator in your area that has the equipment and expertise to repair the kayak. Good luck.
posted 01-04-2010 09:38 PM ET (US)
There's some farm tanks around here, made out of that slippery stuff, that I have fixed using thermo-plastic material from the local plastic supply. I make a patch for both the outside and inside, sandwich it all together with screws, heat gun it to form the material to the repair surface, remove the patches, seal both sides with 5200 or something, re-install and let set for a few days before re-filling with water. Much stronger than before, water tight, and unattractive. If you have the old original royal-x, it is the best synthetic material ever made for canoes/kayaks. Later iterations removed an epa banned ingredient and water-craft were not as resilient after that. An early royal-x anything would be worth my time.
posted 01-04-2010 11:30 PM ET (US)
"Plastic" is a vague term and is too broad in its scope to define a material.
posted 01-04-2010 11:50 PM ET (US)
If it's polyethylene others are correct. My understanding is a "welded" repair may be the best. If a large area you might consider a scab patch, pop rivets and sealant that sticks to the patch material.
posted 01-05-2010 04:32 AM ET (US)
If the hole is 22 cal or a bit bigger,,A flat head bolt washer and nut will work,,If its bigger than 30 cal you need a better backstop ^@^
posted 01-05-2010 09:04 AM ET (US)
Jimh. "Plastic" vague yes. Doesn't matter for the application described. Could be formed aluminum, flexible plywood, anything that might conform to the damaged surface area. Lots of boatmen/women carry a plywood carpeted sandwich with a bolt through the middle as an emergency repair against a holed hull. Whalers need no such hardware. Apologies if I wasn't clear about the repair method.
I have tried Plexus MA 310 High Strength Plastic Adhesive. Since it has solvents to chemically bond with the material, it holds better than regular epoxy, but I wouldn't trust it below waterline as a permanent repair.
posted 01-05-2010 10:25 AM ET (US)
West System G-Flex. http://www.westsystem.com/ss/g-flex-epoxy/
Check out their video of a repair on a roto-molded poly kayak. Took a page from Dick Fischer.
|R T M||
posted 01-05-2010 09:16 PM ET (US)
Thanks plotman, I think you provided the answer I was looking for. I`ll try it.
posted 01-06-2010 08:14 AM ET (US)
You will notice the containers and cartridges used to hold many types of adhesives are in fact made of polyethylene because so little sticks to it.
|R T M||
posted 01-06-2010 12:26 PM ET (US)
Swist, you make a good point. Even catalyzed epoxy is easily removed from a plastic container by just deforming the plastic, very little adhesion. This kayak is manufactured by OCEAN and they recommend the plastic welding rod method so and this kayak already has two repairs done in that method. It also has two small holes in the bottom, that are unrepaired. They will even send you some free plastic "welding rods", and I can get a piece of plastic bu cutting out the hatch piece and adding an actual deck hatch.
posted 01-06-2010 09:34 PM ET (US)
Ya Rich, sounds like Poly E - epoxy won't stick to it. Like downhill ski bottoms you gotta use polyethylene sticks to fix gouges and scratches. I might be wrong but you seem to be on the right track. How'd the thing get a hole in it?
posted 01-06-2010 10:14 PM ET (US)
Binkie, we make polyethylene tanks via roto-molding. When we want to make prototyping changes, we cut and weld parts together with a hot air welder. For patching a small hole you can use a polyethylene rod or possibly melt and smudge the material around the hole together. For patching a large hole, just cut out a matching part or plug from a piece of polyethylene stock and tack into the hole with the hot welder. If the piece closely fits the hole, you can just melt the edges together, otherwise use a polyethylene rod to fill the gap. As noted already, be careful not to melt a hole through the material. Thicker material welds better than thin material. After welding, we liberally coat both sides of the piece with silicone sealant as an extra sealant in case there are itty bitty holes in the weld seam.
Bill in NC
posted 01-06-2010 10:33 PM ET (US)
Are you trying to say West System is trying to sell snake oil in their video?
posted 01-07-2010 04:00 AM ET (US)
PeteB88,,I think your question should be "how did you get several holes in it"
|R T M||
posted 01-07-2010 02:06 PM ET (US)
I don`t know how the holes got there, it came with holes and was cheap. Sounds like holes are pretty commen in these things.
posted 01-07-2010 05:43 PM ET (US)
Than we must find a way to fix the holes,,Its not made by Boston Whaler so we know its not self bailing unless its on saw horses and its usless on saw horses as a kayak
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