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Tool Talk Discussion Forum

Sealant question.

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James in North

05-31-2004 11:47:04




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The coolent overflow tank on my 90 Dodge truck has a crack in it. Is there anything that can be used to seal it up? The tank is plastic.




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Slowpoke

06-02-2004 00:41:36




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 Re: Sealant question. in reply to James in North Carolina, 05-31-2004 11:47:04  
How about epoxy gas tank sealer? I bought some from Big Lots for 50�. It didin't specify for metal or plastic tanks on the package. I used it on my string trimmer plastic tank, and so far, it's holding without leaks. Lots of cars use plastic gas tanks now and most gas cans are plastic. I don't see why it won't work on a water tank.



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MAC,IL

06-01-2004 09:58:07




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 Re: Sealant question. in reply to James in North Carolina, 05-31-2004 11:47:04  
From past experience and future problems it is best to replace it. Money and time ahead.



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Mguy

05-31-2004 19:45:14




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 Re: Sealant question. in reply to James in North Carolina, 05-31-2004 11:47:04  
Good Lord man, there must about a guzillion of 'em tanks in the junkyard,and not all that high dollar, I bet. Mguy.



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Vern-MI

05-31-2004 19:04:13




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 Re: Sealant question. in reply to James in North Carolina, 05-31-2004 11:47:04  
I have fixed polyethylene gas tanks using a woodburning iron and feeder sticks made from a donor tank. I have shaped the tips to perform the sculpting with the hot iron. It does not get too hot and the donor material can be melted into the crack and smoothed over with the iron. Try developing the "skill" on some other piece of polyethylene first.

I have wanted to buy the Harbor Freight Plastic welding Kit Item #41592-1CWH ($30) with the welding rods 41602-1CWH ($4) but haven't done so yet. Seems I always need the repair right now and don't have time to fuss with the order process.

Hope this helps.

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MarkB

05-31-2004 18:07:19




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 Re: Sealant question. in reply to James in North Carolina, 05-31-2004 11:47:04  
Before you go to the goops, try fusing the crack with a soldering iron or a piece of metal that you've heated with a torch. I've had luck doing this on a 70's vintage GM reservoir. There are so many different plastics used in cars, unless you know what you're dealing with it's best not to try to glue them.



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RayNC

05-31-2004 15:37:44




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 Re: Sealant question. in reply to James in North Carolina, 05-31-2004 11:47:04  
James
I've never had any luck with gorilla glue on plastic it seems as though at least one side of the repair has to be pourus (sp) for it to work.
There are plenty of good epoxy's and there is also stuff called 5200 that you can get at any marine supply that will work as well. You could even try plastic welding/soldering the tank back together



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Ron

05-31-2004 12:30:36




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 Re: Sealant question. in reply to James in North Carolina, 05-31-2004 11:47:04  
GOOP or Gorilla glue, any hardware store. The tank must be removed, washed, dried, and then the crack cleaned with alcohol before attempting the repair.



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