The ronseal anti condensation paint adds a layer of insulation to help prevent condensation which leads to mould once its dry thats it job done unless you want to add some colour then you can paint over it any colour your want itll still give the same anti condensation protection before you start make sure the room is above 10c open your doors and windows for ventilation and put down dust sheets to protect anything you dont want to get paint on preparation remove any wallpaper and get rid of