I relined the whole inside of a leaking plastic cistern with glass fibre mat and resin, that was still leak free after two years when I took it out, that was also blue and still in the shed if its the same shade of blue your welcome to it
Edit.
making template to cut glass fibre ,crack is around 4 o clock from the flush outlet hole
Edit.
making template to cut glass fibre ,crack is around 4 o clock from the flush outlet hole
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