I have recently begun removing painted wallpaper off my plaster walls from a 1895 home.
I have noticed that the finish coat (at least what I think is the finish coat) becomes extremely soft and is easily removed. I scrubbed an area and the finish coat came right off. The coat is strong and hard when dry.
A description of the walls from the surface to the back of the wall:
two layers of paint, a layer of wallpaper, a layer of paint and a layer of wallpaper with brown backing, a beige plaster "finish coat" (see above ~1/16 of an inch), gray sandy plaster (~1/4 inch) and lath.
My questions is:
Is this normal and what should I do - should I remove the "finish coat" to sandy layer and replace it?