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Old 03-16-2007, 02:16 PM   #1
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Water tank repair

Can anyone tell me a good "glue" to repair a plactic water tank. There is a crack close to the filler connection that I want to repair.
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Old 03-16-2007, 02:43 PM   #2
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can you tell what type of plastic it is? it could be ABS, polyethaline(sp?), or even fibreglass...

if it's ABS, it can be 'melted' or solvent welded using MEK. locate some scrap ABS and place some chips of the scrap along with some MEK in a glass jar for several hours or days and it will form a 'glue' that you can use like pvc cement.

if you can't tell what it is... test an area with different type solvents (MEK, acetone, lacquer thinner, etc) to see what disolves it.

if nothing dose, you can always 'weld' it with and old soldering pen or something similar by melting the cracked area back together.
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Old 03-16-2007, 04:36 PM   #3
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Talking tn2

If you are going to go to all the trouble of taking it out and welding not knowing if it will hold ,replace it with a new tank.Save yourself a lot of work. Regards from Russell in sunny Tucson Az.
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Old 03-16-2007, 05:27 PM   #4
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Quote:
Originally Posted by tn2
Can anyone tell me a good "glue" to repair a plactic water tank. There is a crack close to the filler connection that I want to repair.
Repairing the old water tanks is usually a waste of time. The plastic has become brittle, and that cannot be repaired.

Melting the crack back together, just causes more brittle spots.

Trying to fix it with solvent, is also a waste of time.

Andy
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Old 03-16-2007, 05:44 PM   #5
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Level of effort

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Originally Posted by Inland RV Center, In
...Trying to fix it with solvent, is also a waste of time.
Unless you are willing to treat the ENTIRE tank with solvent & filler instead of just the cracked area.

OTOH, fresh-water tanks are usually made of the type of plastic that can only be repaired by welding. If that is your case, I would recommend having a new tank built if a "drop-in" replacement can not be found.

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Old 03-16-2007, 05:52 PM   #6
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I had the local RV dealer weld mine and it seems fine. I guess time will tell....

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Old 03-16-2007, 06:11 PM   #7
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tn2,

Just how old is your A/S? I have done plastic welding on a number of cracked tanks and 'most' have held up very well. You will know right away if the weld didn't take.

If you are unfamiliar with plastic welding, find a body shop or RV repair shop and have it professionally done. If the integrity of you tank is otherwise in tack and isn't brittle from age, welding will probably do the trick. The key to proper welding is to use the exact same material as the tank, which is most likely polyethelyne.
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Old 03-16-2007, 06:54 PM   #8
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... If you are unfamiliar with plastic welding, find a body shop or RV repair shop and have it professionally done. ...
Automotive radiator repair shops are encountering a lot of radiators with pastic endcaps. They also have the right tools.

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Old 03-16-2007, 07:44 PM   #9
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Hey ....Thanks for all the good imformation. Since my crack is up toward the top of the tank....only time it leaks is when full....of course I want no leak at all....but I feel it's worth a try to fix it.
Charles
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