laminate flooring

We have brick exterior entry way on our house with plaster interior walls, we have painted the exterior wall 3 times and a reddish brown brick color continues to seep through the paint. Even the Kilz moisture barrier primer will not cover the stains up. How can I get this color to cover up?

My home is from 1920 something and is all masonry and plaster. I am trying to redo a tiny, unused bedroom upstairs. The walls looked like they were crumbling before I dug into them. As I've started tearing into the already peeling parts it looks like there is a top layer of wallpaper, a layer of modern paint below, then some kind of very thin layer of plaster, 1/16 inch or less put over top of what I assume is the original paint on the original plaster. The problem seems to lie in the adhesion on this thin plaster to the orignal paint which is dust in some places but well attached in other places. The original plaster has cracks all over but seems to be structurally good enough. I want to get this all stripped off and then thin coat the plaster and start over. What is the best way to get all these layers off the wall, like I said, it just falls right off in some areas which is nice but it tightly bonded in most of the wall. Thankls