I have a 8500 gallon pond which is block and rendered and coated in G4 with 2 bottom drains gravity feed into filter bay.
Last winter the render cracked resulting in water leaking though the gap about 18 feet long, the builder who built it for me came back and after I emptied the pond he chipped out the old render and re rendered the pond, every one happy so far

This year following more snow and cold, yep the render has blown again

So Ive now decided that the best way forward would be to fiberglass the pond once and for all.
Im looking for someone to carry out the job who wont charge me the earth or some one who would help me do the job on my own, im very capable regarding DIY and also whats needed to do the job and were to buy whats needed.
All help gratefully received
All the best
Mick