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  Dave Sewell September 11, 2012 at 11:22am

  A photo would be really helpfull...
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  Andy Westacott September 11, 2012 at 9:34pm

  I've used aquacote before for a similar but much smaller project that yours:

  http://www.koicarp.org.uk/koi_dry_goods_finish.htm

  It's good stuff goes off with a finish like fibreglass almost, very easy to put on. I found it quite expensive though and you have to work out carefully how much coverage you can realistically get. Might be worth a look.
• PRO

  Nick @ NM Garden Services Ltd September 11, 2012 at 9:43pm

  I would have a look at glass fibre that can be applied in-situ. It can be used for ponds and I had also had a roofer make a glass fibre roof for my office!
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  Garden Doctor Chris September 11, 2012 at 10:36pm

  thanks for the tips Andy and Nick.  I'll look it up.
  
  Andy Westacott said:

  I've used aquacote before for a similar but much smaller project that yours:

  http://www.koicarp.org.uk/koi_dry_goods_finish.htm

  It's good stuff goes off with a finish like fibreglass almost, very easy to put on. I found it quite expensive though and you have to work out carefully how much coverage you can realistically get. Might be worth a look.
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  Jackson's Landscape Design September 11, 2012 at 10:46pm

  Vandex bb75
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  Dave Sewell September 12, 2012 at 10:09am

  Without a picture I'd probably suggest fibreglass. We often use it to line pools. I use this guy - John Bulkley 07711 052 171. Semi retired and living I think in Herts but he would be able to give you a starting price even if you didn't use him.

   
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  Trevor JH Knight September 15, 2012 at 10:40am

  Hi Chris, I have kept Koi carp for over 25 years and am pond number 4. The reason for that is the other 3 worked but not well. The only way to have longevity and peace of mind is Glass Fibre, then a coating with whatever colour you like. It is a bit costly but you end up doing it only the once, you also end up with a very robust barrier to stop any leaks.
  
  Second option is a quality butyl liner but never looks as good and has a limited life span. Nearly all pond people I know always end up with a Glass fibre ponds after wasting hundreds of pounds trying other methods. Hope this helps.
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  Gareth Wilson September 15, 2012 at 2:52pm

  I'd grind out the crack with a disc cutter,to make it around 100mm wide, mix some concrete, with the addition of fibres, pour and tamp, float up. Wait for the concrete to cure then fibre glass the lot.
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  Garden Doctor Chris September 16, 2012 at 4:54pm

  Thanks Dave. I don't know where the leak occurred and which of the visible cracks and lines might be the problem. I haven't taken photos during my only visit. It looks like either glass fibre or a resin such as aqua cote will be the solution to the awkward shape and projectile issue.
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  Garden Doctor Chris September 16, 2012 at 4:55pm

  If fibre grassing is it necessary to worry about opening and filling cracks?