yes the paint as come off but there is also parts of the walls with no paint on and the tiles have de bondedI would say yes . Has the paint come with the tiles .
Who told you that?Scoring the walls in a diamond pattern serves no purpose other than weakening the skim even more.
Go on then enlighten me what exactly does scoring the skim do?Who told you that?
Does the same job as doing same to 6mm plywood on floors?Go on then enlighten me what exactly does scoring the skim do?