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Which standard is to be referred
You could use this one (for pond linings, but it’s also applied to concrete): www.resinlibrary.com/knowledge/guide/how-to-make-a-fibreglass-pond-lining/
Or for a more general overview: www.strandek.co.uk/articles/grp-linings-how-they-can-protect-your-surfaces/
Which standard is to be referred
You could use this one (for pond linings, but it’s also applied to concrete): www.resinlibrary.com/knowledge/guide/how-to-make-a-fibreglass-pond-lining/
Or for a more general overview: www.strandek.co.uk/articles/grp-linings-how-they-can-protect-your-surfaces/