Maybe? Tourpet masonry filler. Possibly should have pva’d it first but yolo.
pva’d
If you reach for that the try 'stabilising solution' instead (PVA isn't permeable) .
Cheers, may grab some in case this doesn’t hold.
@bluehuw started
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Maybe? Tourpet masonry filler. Possibly should have pva’d it first but yolo.