Pre-formed pond liner: adjust the shape?
We've got a plastic pre-formed pond liner that has sunk in one corner.
The liner has a lip that curls outwards and if I could straighten that
out in an upwards direction the extra height would be sufficient to get
a level right across the pond.
Is it possible to deform it? Would, for example, a heat gun soften it
enough for me to get a permanent change?
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