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Flexacryl should work well for those cracks.
Clean the surface so it's ready for adhesion, lay some down using gloves (as it's super sticky) then some scrim tape to bridge the gaps across the cracks, and another layer of Flexacryl on top of the tape.
https://www.screwfix.com/p/bostik-roof-repair-compound-grey-1kg/10990
https://www.screwfix.com/p/diall-fibreglass-mesh-tape-white-90m-x-50mm/626cf
superbagneres
I’m having a bit of a diy nightmare today though. This is the fibreglass roof above my kitchen. Three corners around the rooflight are cracked and I suspect this is the reason for the damp in the picture. What would you do to rectify if you were me?