Painting over Glossy Slippery Weird Multiple Layer Paint on Concrete Wall
I'm trying to chalkboard paint some concrete walls from a 50s renovation at the back of my home. The walls are layered with multiple coats of paint and are slippery and glossy. The last layer of paint on there peels off like peeling skin after sunburn. The walls are not smooth, it's a bumpy and uneven surface.
I have tested straight on top- goes on ok but a bad brushstroke wipes the paint off again and when dry, scratches off using your fingers. I have tried sanding, makes no difference. I have had advice from a plasterer and was told he had never seen such a surface before.
It looks like I will have to strip the walls back to bare concrete before paint will stick.
a) Has anyone encountered this before?
b) What's the best way to strip walls of multiple layers (I see 4) in a kitchen?
Any help appreciated!