I would drill with care, heaven knows what may be buried within that coating you fancy hitting an electric cable or water pipe ? Probably better to chisel away, until you find the wall.
Expect the worst !!
You may still require a wooden block afixed to the wall when you find it, you hardly want enormous screws holding a curtain rail !! Remember, put it up with careful thought about being able to take the lot down .. easily !! Without recreating 'craters'. ie long screw into wall, but encased in filler from wall to surface.
P
Expect the worst !!
You may still require a wooden block afixed to the wall when you find it, you hardly want enormous screws holding a curtain rail !! Remember, put it up with careful thought about being able to take the lot down .. easily !! Without recreating 'craters'. ie long screw into wall, but encased in filler from wall to surface.
P