Tried and failed today to fix coving in my daughter's house, where the walls are cast concrete. I couldn't do what I would normally do, which is to put nails in below the cove to take the weight whilst the adhesive dries, or my other practice, which is to use panel pins driven through the cove and buried below the surface of the coving. The walls are just too bloody hard, with very, very little plaster skim.
Ideas?