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Sealing a crack in toilet cistern

Discussion in 'Plumbing and Central Heating' started by ZACCCC, 6 Oct 2020.

  1. ZACCCC

    ZACCCC

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    The ceramic cistern for my toilet has a crack in it (sorry, it's not a great photo: the crack is from the hole that the down pipe to the toilet bowl goes into and it goes to between 10 and 11 o'clock in the photo.) Previously I've mended it with No Nonsense clear silicone applied from the outside edges of the rubber seal washer to beyond the end of the crack and it's lasted about three years, but it's now leaking again. I've now removed the old silicone as best I can and I'm going to try sealing it again.

    My question is: Is there anything that would work better than silicone sealant (e.g. plumber's mait)? Thanks.
     

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  3. muggles

    muggles

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  4. dilalio

    dilalio

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    Get a new cistern.
    If/when it fails it'll make a right mess.
     
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  5. bennymultifinish

    bennymultifinish

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    get a new one ........ but to answer your question ct1 is probably the only viable option i’ve used.
     
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  6. ZACCCC

    ZACCCC

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    In my original post, by mistake, I gave the wrong information. I said that my cistern was ceramic. I don't know what I was thinking of when I said that! It's not ceramic ... it's plastic! Anyway, I didn't realize my mistake until I'd bought some CT1 and applied it. Unfortunately, it hasn't worked, even though I've had three goes at it, each time applying more CT1 not only inside the cistern but also round the pipe coming out of the cistern to the toilet bowl. But I've still got a very slight leak, so now I'm thinking that perhaps CT1, while suitable for a ceramic repair, isn't the right stuff for repairing a plastic cistern. Do you know if I'm right about this? If so, what I'm intending to do is apply a silicon sealant at the edges of the CT1 sealant that's already there and see if that works. I'd welcome any advice on this. Thanks.
     
  7. dilalio

    dilalio

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    Jeez.... Plastic! Then defo just replace it... Probably get one for the price of a tube of CT1!
     
  8. ZACCCC

    ZACCCC

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    Thanks but the problem I have is that my bathroom suite is ancient and it's in Bermuda blue. I've looked online at cisterns in that colour and they're around the £400 mark
     
  9. Nige F

    Nige F

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    Claim it on your house insurance
     
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  11. dilalio

    dilalio

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    Cheaper than a flood.
     
  12. StephenStephen

    StephenStephen

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    If it were me, I'd be tempted to try milliput
     
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  13. HERTS P&D

    HERTS P&D

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    Time to up date the bathroom, your toilet is probably 50 years old.

    Andy
     
  14. ZACCCC

    ZACCCC

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    I don't have any.
     
  15. ZACCCC

    ZACCCC

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    Thanks, might try that.
     
  16. mattylad

    mattylad

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    ensure the cistern is dry, use a soldering iron on the inside and spread the plastic all over the crack.
     
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  17. Madrab

    Madrab

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    2 part epoxy, use a length of plastic cut from a container etc that will cover the crack, roughen up the area and clean well and apply epoxy. Let it go tacky (follow the instructions) then press on the piece of plastic. Any repair you do will only be temporary.
     
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