I am renovating an old house in Spain.
I have removed all the old tiles from a bathroom and want to plaster then paint the walls.
There is a lot of old tile adhesive left on the walls, which is very difficult to remove. Can I just re-plaster over the top of it? The cement render underneath seems sound.
I want to end up with a rough / rustic look, so it doesn't have to be particularly smooth, just waterproof.