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  David Benson March 10, 2015 at 10:38pm

  there is a paint that you use on flat roofs that has fiberglass strands in it its waterproof but you would have to drain the affected area down

  its not cheap but will do the job get it from builders merchants
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    Richard Gadsby > David Benson March 10, 2015 at 10:40pm

    Thanks i think we're reigned to draining it down already:(
    Will that be safe for the fish? That's my worry getting something that's safe for the plants and fish.
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  David Benson March 10, 2015 at 10:49pm

  I think it will be as its resin based and dries quite hard if you can find a tin check the label before you  buy I will try and find some on line and put a link on

  someone might come up with another idea in the meantime
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    Richard Gadsby > David Benson March 10, 2015 at 10:53pm

    I've just found this which seems like it will do the trick, will be a expensive job by the look of it!
    Can't add link it's called G4 pond paint and sealer on Amazon. Thanks for your help
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  David Benson March 10, 2015 at 11:30pm

  just going to suggest goggling pond sealants as the safety dater on most roof sealants say avoid water courses http://www.screwfix.com/p/thompsons-high-performance-roof-seal-blac...
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  Colin Hunt March 11, 2015 at 6:48am

  We had exactly the same problem on an old concrete pond two years ago, which was part of a larger landscaping job. The pond had broke its back and you could get a brick laying trowel in the crack.  We emptied the pond, pressure washed the concrete, allowed it to dry completely(important!), treated the crack with a pond sealer mastic applied with a mastic gun(can't remember the name'), then applied a clear G4 sealant to the whole pond.  Two years on, it is still watertight although it isn't something you would want to guarantee! I will try and find the name of the mastic later.
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    Richard Gadsby > Colin Hunt March 11, 2015 at 8:00am

    Ok thanks very much sounds like a time consuming job!
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      Colin Hunt > Richard Gadsby March 11, 2015 at 2:40pm

      Overall not that many man hours, but as it is done it stages, you will need to re-visit the site a number of times.  It was ideal for us as we were on site for a month anyway!  
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        Richard Gadsby > Colin Hunt March 11, 2015 at 4:27pm

        Thanks all. Hours are not a problem as I'm there for a whole day every week from now until November then fortnightly so it will fit in fine. If I fill crack on a Friday could I do the seal on the following Monday or is that too soon?
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          Colin Hunt > Richard Gadsby March 11, 2015 at 5:40pm

          That should be fine Richard.  I think this is the crack filler - Polyflex LM Sealer.  http://www.kilmuxkoi.co.uk/Poliflex-Sealer/Poliflex-Sealer-LM-Black...