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Thanks for your replies and advice. A bit more detail - one wall has a smooth finish, this seems ok; the other walls were done the following day and given a 'sponged' finish, this is the one that is soft. I note that one area which has been subjected to water spray over the winter from a badly...

The 5:1 render, with waterproofer, about a year old, can be rubbed away just with finger pressure. It should be possible to paint on some sort of adhesive that will penetrate the render to make it strong enough to be painted. Dilute PVA comes to mind, but is there not a better product designed...