I'm going to tiling the backsplash for my kitchen. My question is how to prepare the wall surface? This is a kitchen reno project, the new cabinets and countertop are already on, and there is paint on the wall where the backsplash is going to be on. Shall I sand the paint off? Or I can simply put the thinset mortar directly on it?
BTW, my backsplash is marble stripes with mesh on the back.
One thing I forgot to mention. The upper part of the wall where the vent hood goes to is unpainted. There was a cabinet, but not I'm going to tiling it and install a chimney vent hood. I don't need do anything to this part of the wall either?