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Tool Talk Discussion Forum

plastic welding

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jam

12-20-2003 06:43:29




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i have a plastic fuel tank that needs a crack repaired. i have a plastic welder but the question is how do i tell what material the tank is made of to match the filler?
Thanks.




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Greywolf

12-21-2003 07:24:33




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 Re: plastic welding in reply to jam, 12-20-2003 06:43:29  
Worst case scenario you could always maybe go with a new "wrap".

Fiberglass cloth with the resin and "wrap" the old tank with a couple layers. Complete wrap would basically give you a new fiberglass tank. Someone with more experience with it can maybe comment further.

Just an idea that popped into my head.



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D.L.

12-22-2003 18:48:20




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 Re: Re: plastic welding in reply to Greywolf, 12-21-2003 07:24:33  
I would definitely NOT use polyester resin over the top of your plastic tank. Problem is that the polyethylene tank is EXTREMELY flexible and the polyester resin IS NOT! What will happen is that the 'glass cloth & resin will form a very hard "shell" around your polyethylene tank... the two will eventually seperate forming a void which the gasoline will quickly fill. Seems to me like a recipe for disaster! I would definitely try to figure out how to weld the polyethylene or replace it!!!

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Ben in KY

12-21-2003 19:37:53




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 Re: Re: plastic welding in reply to Greywolf, 12-21-2003 07:24:33  
Greywolf,
That is about what I was thinking. Should work if you put several layers of cloth on it. What about some of the slosharound type of gastank sealers ? Would they work on plastic. Oh and ruff up the plastic a bit and do a final quick wipedown with some type of no resudue solvent. It seems to get rid of a bit of film on the plastic and allow the resin to adhere better. Also should the epoxy or polyester resin be used? Sorry looking to contribute and seemed to generate more questions.

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Greywolf

12-22-2003 03:23:33




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 Re: Re: Re: plastic welding in reply to Ben in KY, 12-21-2003 19:37:53  
Ben,

I have no experience in using fiberglass other than a one time fix for a horse water tank. I just used the auto body kit from the local auto store.

Other than just offering the idea, I have to step aside as I have no knowledge of fiberglass.



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Davis in SC

12-20-2003 20:44:27




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 Re: plastic welding in reply to jam, 12-20-2003 06:43:29  
Most plastic tanks are made of PE, (Polyethylene) of which there are several kinds. HDPE, LDPE, LLDPE)Some of the newer tanks are actually made of several types of plastic in layers, to provide a barrier to evaporation. Although this plastic is the most impervious one to fuels, the fuels still damage the molecular make-up of the plastic over time. If it has cracked, I imagine it should be replaced rather than repaired. UV from the sun is also an enemy of plastics, causing them to become brittle over time..... ..

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jam

12-21-2003 05:36:05




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 Re: Re: plastic welding in reply to Davis in SC, 12-20-2003 20:44:27  

thanks everyone.
the truth is that the tank is on a 1971 skidoo snowmobile but i did have to move my tractor to get to it.
new tanks are no longer available and to get a patched tank i would need to ship my tank to wis. with $100 attached to it, and they are going to plastic weld it.
i used a pc7 epoxy last year and it lasted a few months but i have not found a compound that is made to stick to plastic and resist gas.
i'm trying to avoid driving around with a jerry can between my legs.

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bob

12-20-2003 21:23:31




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 Re: Re: plastic welding in reply to Davis in SC, 12-20-2003 20:44:27  
He's right- toss it. You dont need the grief & new ones are reasonable if not cheap.



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JDK

12-20-2003 15:40:58




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 Re: plastic welding in reply to jam, 12-20-2003 06:43:29  
The "newer" stuff should have the compound ID molded right into the item somewhere(by law I believe).Some older stuff did too.If not,no idea.



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