A short Soudal video on sealing joints that will be painted over, such as skirting boards, door and window trims, cornices and cracks in walls.
Don’t use silicone on a joint you plan to paint: paint won’t take on it. Use a hybrid polymer such as Fix All Flexi or Multibond SMX50, which take water-based paint, or the acrylic Pereseal 702, which cleans up with water.